intro
Question 1:
What type of alcohol has the highest boiling point?
Topic: Boiling Points in Different Types of Alcohols
Correct Answer: A) Primary alcohols
- In the context of alcohols, boiling points are determined by the strength of intermolecular forces.
- Primary alcohols have a straight chain structure, leading to stronger intermolecular forces when compared to secondary or tertiary alcohols.
- Therefore, primary alcohols generally have a higher boiling point. Hence, the correct answer is A, "Primary alcohols".
Question 2:
What is the reactivity order of alcohols in esterification?
Topic: Reactivity of Alcohols in Esterification
Correct Answer: A) 1° > 2° > 3°
- Esterification is a process where a carboxylic acid reacts with alcohol, forming esters.
- The reactivity of alcohols in this process is determined by their degree and steric hindrance.
- Primary alcohols (1°) are less bulky and thus more reactive than secondary (2°) and tertiary (3°) alcohols.
- Therefore, the correct order of reactivity is 1° > 2° > 3°, making the correct answer A.
Question 3:
What are the monomers for bakelite?
Topic: Monomers in Bakelite Formation
Correct Answer: C) Formaldehyde + Phenol
- Bakelite, a type of polymer, is made from certain monomers.
- The monomers used in the formation of Bakelite are formaldehyde and phenol.
- Consequently, the correct answer is C, "Formaldehyde + Phenol".
Question 4:
What happens to ethers when they are exposed to air and light?
Topic: Ethers and their Reaction to Air and Light
Correct Answer: A) They convert to peroxides
- Ethers react in certain ways when exposed to air and light.
- Specifically, ethers oxidize to form peroxides, which can be explosive.
- As such, the correct answer is A, "They convert to peroxides".
Question 5:
Which type of alcohol is considered the most acidic?
Topic: Acidity in Different Types of Alcohols
Correct Answer: C) Methyl alcohol
- The acidity of alcohols is determined by their ability to donate H+ ions.
- Methyl alcohol readily donates H+ as the resulting methoxide ion is stable, making it the most acidic among the options.
- Therefore, the correct answer is C, "Methyl alcohol".
Question 6:
Which substance reacts with HCHO to form the plastic Bakelite?
Topic: Composition of Bakelite
Correct Answer: B) Phenol
- Bakelite, a type of plastic, is formed from the reaction of certain substances with formaldehyde (HCHO).
- In this case, phenol reacts with HCHO to create Bakelite.
- As a result, the correct answer is B, "Phenol".
Question 7:
Which of the following substances shows the highest solubility for organic compounds?
Topic: Solubility in Organic Solvents
Correct Answer: A) Ethers
- The solubility of organic compounds in solvents is determined by the solvent's ability to dissolve the compound.
- Ethers have a high solubility for organic compounds, and are only slightly soluble in water. This makes them an excellent organic solvent.
- Therefore, the correct answer is A, "Ethers".
Question 8:
What is the order of reactivity of halogen acids towards alcohol?
Topic: Reactivity of Halogen Acids to Alcohol
Correct Answer: C) HI > HBr > HCl
- The reactivity of halogen acids towards alcohol is determined by the bond length in these acids.
- The longer the bond length, the lower the dissociation energy is, resulting in higher reactivity.
- Among halogen acids, the bond length increases from HCl to HI. Therefore, the correct reactivity order is HI > HBr > HCl, making the correct answer C.
Question 9:
What compound is formed when isopropyl alcohol undergoes oxidation?
Topic: Oxidation of Isopropyl Alcohol
Correct Answer: B) Acetone
- During oxidation, different alcohols produce different compounds.
- In the case of isopropyl alcohol, the oxidation process results in the formation of acetone.
- Therefore, the correct answer is B, "Acetone".
Question 10:
What is the product of saponification of coconut oil alongside glycerol?
Topic: Saponification of Coconut Oil
Correct Answer: B) Sodium palmitate
- Saponification is a process in which oils and fats react to produce glycerol and the sodium salt of fatty acids.
- In the case of coconut oil, saponification produces glycerol and sodium palmitate.
- Consequently, the correct answer is B, "Sodium palmitate".
Question 11:
What is the solvent commonly used in the Wurtz reaction?
Topic: Wurtz Reaction and Its Solvent
Correct Answer: A) Ethers
- The Wurtz reaction is a key organic chemistry reaction, involving the coupling of alkyl halides.
- This reaction typically requires a specific type of solvent to proceed effectively.
- Among the options provided, ethers serve as the ideal solvent for the Wurtz reaction.
- Therefore, the correct answer is A, "Ethers".
Question 12:
What is the consequence of adding ethylene glycol to the water in car radiators during winter in cold countries?
Topic: Role of Ethylene Glycol in Car Radiators
Correct Answer: A) Lowering in freezing point
- In cold countries, certain modifications are required to ensure that car radiators function optimally during winter.
- One such modification is the addition of ethylene glycol to the water in radiators.
- This results in the lowering of the freezing point, preventing the water from freezing and ensuring the radiator functions effectively.
- Thus, the correct answer is A, "Lowering in freezing point".
Question 13:
What is the hybridization of the functional group carbon in tertiary butyl alcohol?
Topic: Hybridization in Tertiary Butyl Alcohol
Correct Answer: D) sp3
- In organic chemistry, understanding the hybridization of functional groups is important to predict the behavior of a compound.
- Tertiary butyl alcohol is a type of alcohol where the carbon of the functional group is bonded to three other carbon atoms.
- The functional group carbon in tertiary butyl alcohol is sp3 hybridized.
- Therefore, the correct answer is D, "sp3".
Question 14:
What is the IUPAC name of the compound?
Topic: IUPAC Naming
Correct Answer: A) 3, 5, 5- trimethylhexane-2,4-diol
- The IUPAC nomenclature is an internationally recognized system for naming compounds.
- It follows a set of rules that include identifying the longest carbon chain as the parent chain and numbering it to give the smallest set of locants.
- Substituents are also considered and arranged in alphabetical order.
- Using these rules, the correct IUPAC name for the compound in question is A) 3, 5, 5- trimethylhexane-2,4-diol.
Question 15:
What are alcohols with two hydroxyl groups known as?
Topic: Classification of Alcohols
Correct Answer: D) Both A and B
- Alcohols can have one, two, or more hydroxyl (-OH) groups.
- When alcohols have two hydroxyl groups, they are known as diols or glycols.
- Therefore, both "alkane diols" and "glycols" are correct names for alcohols with two hydroxyl groups, making option D the correct answer.
Question 16:
What can be used to dehydrate alcohol?
Topic: Dehydration of Alcohol
Correct Answer: D) All of them
- Dehydration of alcohol is a chemical process that involves removing a molecule of water from the alcohol.
- P4O10, H2SO4, and H3PO4 are all effective dehydrating agents used for this purpose.
- Therefore, all of these substances can be used to dehydrate alcohols, making option D the correct answer.
Question 17:
Which among the following is recognized as an industrial method for methanol preparation?
Topic: Industrial Preparation of Methanol
Correct Answer: A) Catalytic reduction of CO with ZnO and Cr2O3
- Methanol is industrially produced through various methods.
- The catalytic reduction of carbon monoxide (CO) with ZnO and Cr2O3 is a recognized industrial method for methanol preparation.
- Therefore, option A is the correct response.
Question 18:
What is the correct sequence for the ease of esterification of the given acids with CH3OH?
(I) HCOOH
(II) CH3COOH
(III) CH3CH2COOH
Topic: Esterification of Acids
Correct Answer: D) III < II < I
- Esterification is a chemical process that involves converting a carboxylic acid and an alcohol into an ester.
- The ease of esterification depends on the size of the alkyl group in R – COOH.
- Smaller alkyl groups esterify more easily.
- Therefore, the correct sequence from easiest to hardest esterification is III < II < I, making option D the correct answer.
Question 19:
Williamson’s synthesis is typically employed in the preparation of which compound?
Topic: Williamson’s Synthesis
Correct Answer: B) Ethers
- Williamson’s synthesis is a laboratory method used for the preparation of specific types of compounds.
- It is primarily employed for the production of symmetrical and unsymmetrical ethers.
- Therefore, ethers are the main compounds produced via Williamson’s synthesis, making option B the correct answer.
Question 20:
What is the general formula for alcohol?
Topic: General Formula of Alcohol
Correct Answer: B) CnH2n+1OH
- Alcohols are organic compounds characterized by the presence of one or more hydroxyl (-OH) groups attached to a carbon atom.
- The general molecular formula for alcohols is represented as CnH2n+1OH, where 'n' stands for the number of carbon atoms.
- The hydroxyl group in the formula is a key feature of alcohols.
- Therefore, option B is the correct answer.
Question 21:
Which among the listed experiments can be used to demonstrate the presence of an –OH group?
Topic: Identification of –OH Group
Correct Answer: D) All of the above
- Various tests can be performed to detect the presence of an -OH group in a compound.
- Sodium reacts exothermically with alcohols, acylation converts alcohols into esters indicating the presence of an -OH group, and the reaction with PCl5 replaces the -OH group with a chloride ion.
- Therefore, all listed tests (A, B, and C) can indicate the presence of an -OH group, making option D the correct answer.
Question 22:
What reagent would replace the –OH group in alcohol with a halogen atom?
Topic: Replacement of –OH Group in Alcohols
Correct Answer: C) SOCl2
- Reagents are used in chemistry to cause a chemical reaction or test if one occurs.
- In the context of alcohols, certain reagents can replace the -OH group with a halogen atom.
- Thionyl chloride (SOCl2) is one such reagent that effectively substitutes the -OH group with a chloride ion in the alcohol.
- Therefore, C) SOCl2 is the correct answer.
Question 23:
What term is used to refer to 100% pure ethyl alcohol?
Topic: Absolute Alcohol
Correct Answer: C) Absolute alcohol
- Ethyl alcohol, also known as ethanol, can exist in varying degrees of purity.
- The term "absolute alcohol" refers to ethanol that is 100% pure.
- It is typically prepared from rectified spirit using the azeotropic distillation method.
- Therefore, C) Absolute alcohol is the correct answer.
Question 24:
Why is phenol more easily nitrated than benzene?
Topic: Nitration of Phenol and Benzene
Correct Answer: A) The -OH group in phenol increases electron density at the ortho and para positions.
- Phenol is more reactive than benzene due to the presence of an -OH group, which affects its chemical reactivity.
- This -OH group increases the electron density at the ortho and para positions on the benzene ring, activating it towards electrophilic substitution.
- As a result, incoming groups are directed to these positions, making phenol more susceptible to nitration.
- Therefore, A) The -OH group in phenol increases electron density at the ortho and para positions is the correct answer.
Question 25:
Which alcohol among the following is least soluble in water?
Topic: Solubility of Alcohols
Correct Answer: D) C4H9OH
- Solubility of alcohols in water is determined by various factors, one of which is the size of the alcohol molecule.
- Generally, as the number of carbon atoms in the alcohol increases, its solubility in water decreases.
- Therefore, among the given options, C4H9OH, having the greatest number of carbon atoms, is the least soluble in water.
- Hence, D) C4H9OH is the correct answer.