Hydrocarbon Test 1

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MCQs 1:

What process converts liquid hydrocarbons into a mixture of gaseous hydrocarbons?





Topic: Conversion of Hydrocarbons

Correct Answer: A) Cracking

Detailed Hint:
  • The question investigates the process used to convert liquid hydrocarbons into gaseous hydrocarbons.
  • Among the options provided, cracking, as the name implies, involves breaking down higher hydrocarbons into lower, more volatile hydrocarbons.
  • While hydrolysis, oxidation, and distillation are also methods of manipulating hydrocarbons, they don't result in the same conversion as cracking.
  • Hydrolysis involves water molecules, oxidation involves oxygen, and distillation is a separation technique based on differences in boiling points.
  • In summary, the answer is A, "Cracking", which allows for the transformation of higher, less volatile hydrocarbons into lower, more volatile, gaseous hydrocarbons.

MCQs 2:

What is the correct IUPAC name for the given hydrocarbon compound?





Topic: IUPAC Nomenclature

Correct Answer: C) 3–ethyl–2–methyl hexane

Detailed Hint:
  • The question asks about the correct IUPAC nomenclature of a given hydrocarbon compound.
  • In IUPAC nomenclature, we choose the longest chain as the parent chain and the rest as substituents.
  • When two chains of equal length are present, choose that chain which has a greater number of substituents.
  • Hence, the correct answer is C, "3–ethyl–2–methyl hexane".

MCQs 3:

What is the IUPAC name of the given compound: (CH3)2CH(CH2)2C(CH3)3?





Topic: IUPAC Nomenclature

Correct Answer: D) 2,2,5-Trimethyl hexane

Detailed Hint:
  • The question asks for the IUPAC nomenclature of a specified compound.
  • In naming, the longest carbon chain is taken as the base name and the side chains as substituents. The positions of the substituents are indicated by numbers.
  • Here, the longest chain is hexane and there are three methyl groups at the 2nd and 5th carbon.
  • Hence, the correct IUPAC name is D) 2,2,5-Trimethyl hexane.

MCQs 4:

What is the product formed when 2– Butyne undergoes hydrogenation in the presence of Na-Liq NH3 catalyst?





Topic: Hydrogenation of Alkynes

Correct Answer: A) Trans 2-Butene

Detailed Hint:
  • The question investigates the product of the hydrogenation of 2– Butyne using a Na-Liq NH3 catalyst.
  • In the context of alkynes, hydrogenation in the presence of a Sodium liquid Ammonia catalyst typically results in the formation of a trans alkene.
  • Hence, the correct answer is A) Trans 2-Butene.

MCQs 5:

What is the heat of hydrogenation for most alkenes for each double bond?





Topic: Heat of Hydrogenation

Correct Answer: B) 120 kJ/mol

Detailed Hint:
  • The question is about the amount of heat released during the hydrogenation of each double bond in most alkenes.
  • Hydrogenation is the process of adding hydrogen atoms to a molecule, typically in an alkene.
  • Heat of hydrogenation is the heat energy released when a double bond in an alkene breaks and forms single bonds with hydrogen.
  • The correct answer is B) 120 kJ/mol, which indicates that for each double bond in most alkenes, 120 kJ/mol of energy is released during hydrogenation.

MCQs 6:

Which of the following statements is true regarding ethane?





Topic: Properties of Ethane

Correct Answer: D) All

Detailed Hint:
  • The question is asking about the properties of ethane.
  • Ethane is a gaseous substance at room temperature, making option A correct.
  • Ethane is also sp3 hybridized, which means its carbon atoms have four orbitals that form a tetrahedral shape, thus option B is correct.
  • Further, it is an aliphatic hydrocarbon, a type of hydrocarbon containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings, making option C correct.
  • Therefore, the correct answer is D) All.

MCQs 7:

What is the name of the given skeletal structure?





Topic: Nomenclature of Organic Compounds

Correct Answer: C) Diethyl ether

Detailed Hint:
  • The question is asking to identify the name of the given skeletal structure.
  • To answer this correctly, one should understand the basic principles of naming organic compounds.
  • Looking at the structure, it is clear that an oxygen atom is connected to two ethyl groups, which is characteristic of ethers.
  • Hence, the correct name for the compound is C) Diethyl ether.

MCQs 8:

Who was the pioneer in laboratory synthesis of the first organic compound?





Topic: History of Organic Chemistry

Correct Answer: A) Wohler

Detailed Hints:
  • This query examines the individual who first successfully manufactured an organic compound within a laboratory setting.
  • Organic compounds were originally thought to be only derivable from living organisms until this achievement.
  • The compound synthesized was urea, derived from NH4CNO.
  • Wohler was the chemist who accomplished this, marking a significant point in the history of organic chemistry.
  • Hence, the correct answer is A) Wohler.

MCQs 9:

Identify the organic compound depicted in the given diagram.





Topic: Organic Compounds Identification

Correct Answer: B) Benzene

Detailed Hints:
  • The question involves the correct identification of the organic compound shown in the provided diagram.
  • To successfully respond, one should possess a firm understanding of the structures of diverse organic compounds.
  • In this instance, the correct answer is B) Benzene, an aromatic hydrocarbon with a ring structure.

MCQs 10:

Which of the following statements correctly describes the propagation phase of the free radical mechanism?





Topic: Free Radical Mechanism

Correct Answer: C) Consumption as well as production of another free radical

Detailed Hint:
  • The question pertains to the propagation stage of the free radical mechanism.
  • Understanding the steps involved in the free radical mechanism is crucial to answering this question correctly.
  • This stage involves both the consumption and creation of another free radical, as depicted by the reactions: CH4 + Cl• ⟶ CH3• + HCl and CH3• + Cl2 ⟶ CH3Cl + Cl•.
  • Hence, the correct answer is C) Consumption as well as production of another free radical.

MCQs 11:

Which compound shares the same general formula as Alkanes?





Topic: General Formulas in Organic Chemistry

Correct Answer: D) None

Detailed Hint:
  • This question is seeking to identify if any other class of compounds shares the same general formula with alkanes.
  • Alkanes have a general formula of CnH2n+2, which is unique to them.
  • None of the options provided (Alkenes, Cycloalkanes, or Alcohols) share this specific formula.
  • Thus, the correct answer is D) None.

MCQs 12:

Which compound contains both sp2 and sp3 hybridized carbons?





Topic: Hybridization in Organic Compounds

Correct Answer: C) C3H6

Detailed Hint:
  • This question is testing knowledge on the concept of hybridization in organic compounds.
  • Hybridization refers to the combination of atomic orbitals to form new hybrid orbitals.
  • In the compound propene (C3H6), there are sp2 hybridized carbons (the double-bonded carbons) and an sp3 hybridized carbon (the single-bonded carbon).
  • Therefore, the correct answer is C) C3H6.

MCQs 13:

Which compound has the highest boiling point?





Topic: Boiling Points of Organic Compounds

Correct Answer: C) 2, 3-dimethyl butane

Detailed Hint:
  • The question is asking about the boiling points of specific organic compounds.
  • Generally, the boiling point of a compound is influenced by the number of carbons it contains; the more carbons, the higher the boiling point.
  • 2, 3-dimethyl butane has the highest number of carbons among the options listed, so its boiling point is highest.
  • Therefore, the correct answer is C) 2, 3-dimethyl butane.

MCQs 14:

What is the product formed when Calcium Carbide reacts with water?





Topic: Chemical Reactions of Carbides

Correct Answer: A) Ethyne

Detailed Hint:
  • The question centers on the chemical reaction that occurs when Calcium Carbide interacts with water.
  • The understanding of various chemical reactions and their products is necessary to answer this question correctly.
  • The reaction of Calcium Carbide (CaC2) with water yields Ethyne (C2H2) and Calcium Hydroxide (Ca(OH)2).
  • Hence, the correct answer is A) Ethyne.

MCQ 15:

Which reaction should benzene undergo to accelerate its sulphonation?





Topic: Benzene Reactions

Correct Answer: A) Alkylation

Detailed Hint:
  • This question is about enhancing the rate of sulphonation in benzene.
  • A solid understanding of various reactions benzene can undergo and their impact on its reactivity is required.
  • Benzene's sulphonation can be sped up by alkylation, which results in an activated alkyl benzene that reacts faster than benzene.
  • Therefore, the correct answer is A) Alkylation.

MCQ 16:

What is the name of the reaction in which benzene is acylated to produce aliphatic aromatic ketones?





Topic: Benzene Reactions

Correct Answer: D) Friedel-Craft's reaction

Detailed Hint:
  • This question is about the nomenclature of a specific reaction in which benzene is acylated.
  • Understanding the various reactions that benzene can undergo and their names is crucial to answer this correctly.
  • The reaction where benzene undergoes acylation to produce aliphatic aromatic ketones is known as the Friedel-Craft's reaction.
  • Thus, the correct answer is D) Friedel-Craft's reaction.

MCQ 17:

What is the total number of pi electrons in Anthracene, which contains three benzene rings?





Topic: Structure and Bonding in Aromatic Compounds

Correct Answer: A) 14

Detailed Hint:
  • This question is about the understanding of electronic structure in aromatic compounds like Anthracene.
  • Anthracene is a polycyclic aromatic hydrocarbon consisting of three fused benzene rings.
  • Each benzene ring contains 6 π electrons, but the middle ring shares two of its π electrons with the two adjoining rings, totaling to 14 π electrons.
  • Therefore, the correct answer is A) 14.

MCQ 18:

Which alcohol can be dehydrated by 60% H2SO4 at 100°C to produce alkene?





Topic: Alcohol Dehydration Reactions

Correct Answer: A) Isopropanol

Detailed Hint:
  • The question is about the dehydration of alcohols, a common reaction in organic chemistry.
  • Dehydration refers to the removal of a molecule of water from the alcohol, and this reaction is facilitated by an acid catalyst like H2SO4.
  • In this case, Isopropanol, a secondary alcohol, is dehydrated by 60% H2SO4 at 100°C to form an alkene.
  • Hence, the correct answer is A) Isopropanol.

MCQ 19:

Which compound turns Tollen’s reagent white upon reaction with it?





Topic: Reactions with Tollen’s Reagent

Correct Answer: C) Acetylene

Detailed Hint:
  • The question asks about the reactivity of different compounds with Tollen's reagent.
  • Tollen's reagent, also known as ammoniacal silver nitrate, is used to test for the presence of aldehydes and certain types of alkynes.
  • In this case, Acetylene, an acidic alkyne, forms a white precipitate upon reaction with Tollen's reagent.
  • Therefore, the correct answer is C) Acetylene.

MCQ 20:

Which alkyne yields an aldehyde upon hydration?





Topic: Alkyne Hydration

Correct Answer: B) Ethyne

Detailed Hint:
  • This question involves knowledge about the hydration reactions of alkynes and the products they yield.
  • Hydration of an alkyne involves the addition of water across a triple bond.
  • Generally, alkynes upon hydration yield ketones, but Ethyne is an exception, which yields an aldehyde.
  • Hence, the correct answer is B) Ethyne.

MCQ 21:

In which of the following reactions does the oxidation of carbon occur?





Topic: Oxidation Reactions

Correct Answer: C) Conversion of CH4 to CH3OH

Detailed Hint:
  • The question is about understanding where the oxidation of carbon takes place among the given reactions.
  • Oxidation in organic chemistry typically involves an increase in the oxygen-to-carbon ratio.
  • In the conversion of CH4 to CH3OH, a hydrogen atom in methane is replaced by a hydroxyl group, indicating an oxidation process.
  • Thus, the correct answer is C) Conversion of CH4 to CH3OH.

MCQs 22:

What is the effect of adding an electronegative element to a carbocation?





Topic: Stability of Carbocations

Correct Answer: A) It becomes less stable

Detailed Hint:
  • This question tests the understanding of the stability of carbocations on addition of electronegative elements.
  • Electronegative elements have a tendency to draw electrons towards themselves.
  • When added to a carbocation, they withdraw electrons, making the carbocation less stable.
  • Therefore, the correct answer is A) It becomes less stable.

MCQs 23:

Which of the following would lead to the maximum yield if a nucleophilic substitution were to occur?





Topic: Nucleophilic Substitution Reactions

Correct Answer: A) NH2–

Detailed Hint:
  • The question is about nucleophilic substitution reactions, which are fundamental reactions in organic chemistry.
  • Nucleophilic substitution involves a nucleophile, which is a species rich in electrons and capable of donating an electron pair.
  • Among the options, NH2– is a strong nucleophile and would lead to a greater yield in the product.
  • Therefore, the correct answer is A) NH2–.

MCQs 24:

Identify the reaction that would produce the least yield:





Topic: Reactivity of Organic Compounds

Correct Answer: D) Reaction D

Detailed Hint:
  • The question is about determining the least reactive compound among the options.
  • The yield of a reaction is largely dependent on the reactivity of the compounds involved.
  • In this case, reaction D involves nitrobenzene, which contains a deactivating nitro group and hence is least reactive.
  • Consequently, the correct answer is D) Reaction D.

MCQs 25:

When does the addition of HX to an alkene follow Markovnikov's rule?





Topic: Markovnikov’s Rule in Organic Reactions

Correct Answer: D) 1–butene

Detailed Hint:
  • This question is asking about Markovnikov's rule, a principle in organic chemistry that guides the products of the addition of HX to alkenes.
  • Markovnikov's rule states that in the addition of HX to an alkene, the hydrogen atom adds to the carbon with the most hydrogen atoms, and the halogen atom to the carbon with fewer hydrogen atoms.
  • 1-butene is a terminal, unsymmetrical alkene, therefore when HX is added, it follows Markovnikov's rule.
  • Thus, the correct answer is D) 1–butene.

MCQs 26:

Which of the following compounds displays metamerism?





Topic: Metamerism in Organic Compounds

Correct Answer: D) Ethyl ethanoate

Detailed Hint:
  • This question involves understanding the concept of metamerism in organic chemistry, which is a type of isomerism where compounds with the same molecular formula but different number and arrangement of carbon atoms in the alkyl group are formed.
  • Among the given options, Ethyl ethanoate exhibits metamerism because it has two parts, ethyl and ethanoate, which can be rearranged to form different metamers.
  • Therefore, the correct answer is D) Ethyl ethanoate.

MCQs 27:

In which of the following transformations are KOH/N2H2 typically used?





Topic: Chemical Transformations in Organic Chemistry

Correct Answer: A) Aldehydes to alkanes

Detailed Hint:
  • This question tests the knowledge of specific chemical transformations involving the use of KOH/N2H2.
  • These reagents are typically used in the Wolf Kishner reduction, which transforms aldehydes into alkanes.
  • Consequently, the correct response is A) Aldehydes to alkanes.

MCQs 28:

Which cycloalkane listed below is the most stable?





Topic: Stability of Cycloalkanes

Correct Answer: D) Cyclohexane

Detailed Hint:
  • This question involves recognizing the factors that contribute to the stability of cycloalkanes.
  • Cycloalkanes' stability is determined by factors like ring strain, which reduces as the number of carbons in the ring increases.
  • Among the options, cyclohexane is a six-membered ring and has the least ring strain, making it the most stable.
  • Hence, the correct answer is D) Cyclohexane.

Question 29:

What type of reaction is involved in the formation of an Ester?





Topic: Reactions in Organic Chemistry

Correct Answer: C) Condensation

Detailed Hints:
  • This question requires understanding of the different types of reactions in organic chemistry.
  • The formation of an Ester typically involves a condensation reaction, where two smaller molecules combine to form a larger molecule with the release of a small molecule such as water.
  • Therefore, the correct answer is C) Condensation.

Question 30:

Identify the fifth member of the alkyne family:





Topic: Hydrocarbon Nomenclature in Organic Chemistry

Correct Answer: C) Hexyne

Detailed Hints:
  • This question pertains to the naming and ordering of members in the alkyne family of hydrocarbons.
  • The alkyne family begins from the two carbon compound, ethyne. Following this order, the fifth member would have six carbons.
  • Thus, the correct answer is C) Hexyne.

Question 31:

Select the pair that represents functional group isomers:





Topic: Isomerism in Organic Chemistry

Correct Answer: B) Ethanol & Diethyl Ether

Detailed Hints:
  • This question is about recognizing functional group isomers, compounds with the same molecular formula but different functional groups.
  • Among the options provided, Ethanol and Diethyl Ether are functional group isomers as they have the same molecular formula, C4H10O, but different functional groups (an alcohol and an ether, respectively).
  • Therefore, the correct answer is B) Ethanol & Diethyl Ether.

Question 32:

What is the resonance energy of benzene?





Topic: Stability and Energy of Benzene

Correct Answer: D) 150.5 kJmol-1

Detailed Hints:
  • This question examines your comprehension of the concept of resonance energy in the context of benzene, a key molecule in organic chemistry.
  • Resonance energy is the energy difference between a real molecular structure and the most stable of its hypothetical contributing structures.
  • The resonance energy of benzene can be calculated from the heat of hydrogenation per double bond and comparing the expected value with the experimental value.
  • Therefore, the correctly calculated resonance energy is D) 150.5 kJmol-1.

Question 33:

What are the products X & Y in the given reaction?





Topic: Reaction Products in Organic Chemistry

Correct Answer: C) Propanal and Ethanal

Detailed Hints:
  • This question calls for a correct identification of the products resulting from a certain reaction.
  • Understanding the transformation of reactants into products in organic reactions is crucial.
  • From the given choices, the products X & Y are C) Propanal and Ethanal.

Question 34:

Which of the following processes is an illustration of the Sabatier and Senderens reaction?





Topic: Classification of Reactions in Organic Chemistry

Correct Answer: A) Process A

Detailed Hints:
  • This question deals with the Sabatier and Senderens reaction, a key concept in organic chemistry.
  • The Sabatier and Senderens reaction involves the addition of hydrogen to alkenes.
  • Therefore, the process that accurately exemplifies this reaction is A) Process A.

Question 35:

Which compound will most rapidly undergo a radical substitution reaction?





Topic: Radical Substitution in Organic Chemistry

Correct Answer: B) Compound B

Detailed Hints:
  • This question is about the speed of radical substitution reactions in different compounds.
  • In a radical substitution reaction, the ease of replacement and the reactivity of the replacing radical significantly influence the rate of the reaction.
  • Among the given options, Compound B involves the replacement of a tertiary hydrogen, which is easiest to replace, and the replacing radical is chlorine, which reacts more quickly than others.
  • Therefore, the compound that will undergo a radical substitution reaction most rapidly is B) Compound B.
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