Alcohols, Phenols and Ethers Test 1

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MCQs 1:

Which of the following methods results in the formation of tertiary alcohol?






Topic: Alcohols and their Synthesis Methods

Correct Answer: A) RMgX + ketone

Detailed Hint:
  • Tertiary alcohols can be synthesized in various ways, but the option that stands out in this list is RMgX + ketone.
  • The reaction of RMgX (Grignard's reagent) with a ketone results in the formation of tertiary alcohol.
  • While other options hint toward different alcohol types or non-alcohol compounds, RMgX + ketone is the only correct choice for forming tertiary alcohol.
  • Therefore, the correct response is A, "RMgX + ketone".

MCQs 2:

What is the accurate method for the preparation of phenol?





Topic: Phenol Preparation Methods

Correct Answer: D) All of the above

Detailed Hint:
  • Phenol can be prepared through various methods, all of which are mentioned in the options.
  • Acidic oxidation of cumene, nucleophilic substitution of chlorobenzene and hydrolysis of diazonium salt are all valid methods.
  • As all these methods lead to the formation of phenol, the correct answer is D, "All of the above".

MCQs 3:

Phenol reacts with an acyl halide to form which of the following?





Topic: Reactions of Phenol

Correct Answer: C) Aromatic ester

Detailed Hint:
  • The reaction between phenol and an acyl halide results in an important transformation.
  • The hydrogen atom of the phenol and the halide atom of the acyl halide are eliminated.
  • The acyl group then links with the phenoxide group of the phenol to form an aromatic ester.
  • Thus, the correct answer is C, "Aromatic ester".

MCQs 4:

Which of the following is the correct method to obtain Picric acid?





Topic: Synthesis of Picric acid

Correct Answer: C) Nitration of phenol

Detailed Hint:
  • Picric acid is a derivative of phenol, formed by nitration of phenol.
  • The other three options are incorrect as they all form different compounds on reacting with nitric acid.
  • Hence, the correct answer is C, "Nitration of phenol".

MCQs 5:

What is the order of reactivity of alcohols when they react with NH3?





Topic: Reactivity of Alcohols with NH3

Correct Answer: A) 3o > 2o > 1o

Detailed Hint:
  • When alcohols react with NH3, the R–O bond of the alcohol breaks as NH2 acts as a nucleophile.
  • This nucleophilic attack results in different reactivity among primary, secondary, and tertiary alcohols.
  • The order of reactivity is most for tertiary alcohols, followed by secondary and then primary.
  • Hence, the correct answer is A, "3o > 2o > 1o".

MCQs 6:

In the preparation of phenol using chlorobenzene (Dow’s method), which type of reaction takes place?





Topic: Preparation of Phenol using Dow's Method

Correct Answer: C) Nucleophilic substitution

Detailed Hint:
  • Dow's method involves the preparation of phenol from chlorobenzene.
  • Under extreme conditions, chlorobenzene can undergo a certain type of reaction.
  • This reaction involves the replacement of one group (in this case, the chlorine atom) by another group (OH, forming phenol). This is known as nucleophilic substitution.
  • Hence, the correct answer is C, "Nucleophilic substitution".

MCQs 7:

In the Lucas test, which type of alcohols form an oily layer immediately?





Topic: Lucas Test and Alcohol Types

Correct Answer: C) Tertiary alcohols

Detailed Hint:
  • The Lucas test is a qualitative test used in chemistry to distinguish between different types of alcohols.
  • In this test, the type of alcohol is ascertained by the time it takes to form an oily layer.
  • Tertiary alcohols react the fastest, forming an oily layer immediately.
  • Hence, the correct answer is C, "Tertiary alcohols".

Question 8:

What is the resultant product when secondary alcohols are oxidized in the presence of Na2Cr2O7?





Topic: Oxidation of Secondary Alcohols

Correct Answer: C) Ketones

Detailed Hint:
  • When secondary alcohols are subjected to oxidation in the presence of Na2Cr2O7, a particular type of organic compound is formed.
  • This compound is characterized by a carbonyl group bonded to two other carbon atoms, distinguishing it from alkenes, alkynes, and alkyl halides.
  • Therefore, the correct answer is C, "Ketones".

Question 9:

What is the order of reactivity in the process of dehydration of alcohol?





Topic: Dehydration of Alcohol

Correct Answer: C) 1° < 2° < 3°

Detailed Hint:
  • The dehydration of alcohol refers to the removal of a molecule of water leaving behind an alkene.
  • Among the primary, secondary, and tertiary alcohols, the order of reactivity varies.
  • The correct order is such that tertiary alcohols are most reactive, followed by secondary and then primary alcohols.
  • Hence, the correct answer is C, "1° < 2° < 3°".

Question 10:

Which type of alcohols among the following is positive for the iodoform test?





Topic: Iodoform Test for Alcohols

Correct Answer: A) Primary alcohols

Detailed Hint:
  • The iodoform test is a chemical reaction used to identify the presence of certain types of alcohols.
  • Among primary, secondary, and tertiary alcohols, only one category exhibits a positive result in this test.
  • Such alcohols include ethanol and those with a CH3CHOH group.
  • Thus, the correct answer is A, "Primary alcohols".

Question 11:

What is the appropriate term for 95% ethanol?





Topic: Classification of Ethanol

Correct Answer: B) Rectified spirit

Detailed Hint:
  • Ethanol, also known as ethyl alcohol, is classified based on its concentration.
  • The term for 95% ethanol is distinct from absolute ethanol, denatured alcohol, and formalin.
  • Therefore, the correct answer is B, "Rectified spirit".

Question 12:

What is the alternate name for the simplest phenol, C6H5OH?





Topic: Definition of Phenol

Correct Answer: C) Carbolic acid

Detailed Hint:
  • Phenols are a type of organic compound, of which C6H5OH is the simplest form.
  • This compound has a specific alternate name that differentiates it from carbonic acid, acetic acid, and sulphonic acid.
  • Thus, the correct answer is C, "Carbolic acid".

Question 13:

Which of the following is the most acidic alcohol?





Topic: Acidity of Alcohols

Correct Answer: A) Methanol

Detailed Hint:
  • The acidity of an alcohol is influenced by the size of its alkyl group.
  • Among methanol, ethanol, isopropanol, and propanol, one has the smallest alkyl group.
  • Hence, the correct answer is A, "Methanol".

Question 14:

Which of the following reagents is not adequate for transforming an alcohol into an alkyl halide?





Topic: Preparation of Alkyl Halides from Alcohols

Correct Answer: A) NaCl

Detailed Hint:
  • To prepare alkyl halides from alcohols, an appropriate reagent that can replace the hydroxyl group with a halogen is required.
  • Among NaCl, PCl5, SOCl2, and ZnCl2 + HCl, one of them is not suitable for this process.
  • Thus, the correct answer is A, "NaCl".

Question 15:

What is the main product when 2-chlorobutane is treated with alcoholic KOH?





Topic: Reaction of 2-Chlorobutane with Alcoholic KOH

Correct Answer: D) 2-Butene

Detailed Hint:
  • Alcoholic KOH is a base that causes eliminations when reacting with alkyl halides.
  • The reaction of 2-chlorobutane with alcoholic KOH results in a specific alkene.
  • The major product is the more stable alkene, which is 2-butene.
  • Hence, the correct answer is D, "2-Butene".

Question 16:

Which primary alcohol exclusively produces a positive result in the iodoform test?





Topic: Iodoform Test with Primary Alcohols

Correct Answer: B) Ethanol

Detailed Hint:
  • The iodoform test is a method used to identify certain types of alcohols.
  • Among primary alcohols, only one exhibits a positive reaction in this test.
  • As a result, the correct answer is B, "Ethanol".

Question 17:

What is the standard structural formula for "Alcohol"?





Topic: Structural Formula of Alcohols

Correct Answer: B) ROH

Detailed Hint:
  • Alcohols are organic compounds characterized by specific structural formula.
  • This formula includes the R group (any alkyl or aryl group), the oxygen atom (O), and the hydrogen atom (H).
  • Comparing the options ROR, ROH, ROOH, and RCOOH, one fits the description of alcohols' formula.
  • Consequently, the right answer is B, "ROH".

Question 18:

Which alcohol is more acidic than water?





Topic: Acidity of Alcohols

Correct Answer: D) Methanol

Detailed Hint:
  • The acidity of alcohols is typically determined by the number and size of their alkyl groups.
  • In comparison to water, only one of the given options is more acidic.
  • Tert-butyl alcohol, isopropyl alcohol, ethanol, and methanol are the options, but only one of them exceeds water's acidity.
  • As a result, the correct answer is D, "Methanol".

Question 19:

'Phenol and formaldehyde' polymerize to create which compound?





Topic: Polymerization of Phenol and Formaldehyde

Correct Answer: B) Phenol and formaldehyde

Detailed Hint:
  • Certain organic compounds polymerize, or combine in a chemical reaction, to form new substances.
  • This process occurs when phenol and formaldehyde combine.
  • The options NH3 & formaldehyde, phenol and formaldehyde, benzene & phenol, and acetaldehyde & formaldehyde are given, but only one of them corresponds to the substance created by polymerizing phenol and formaldehyde.
  • Therefore, the right answer is B, "Phenol and formaldehyde".

Question 20:

Which catalyst promotes the oxidation of primary alcohols into aldehydes?





Topic: Oxidation of Primary Alcohols

Correct Answer: D) K2Cr2O7 + H2SO4

Detailed Hint:
  • Primary alcohols undergo oxidation to transform into aldehydes, but this reaction requires a specific catalyst.
  • The potential catalysts listed, Cu + H2SO4, V2O5 + H2SO4, Al2O3 + H2SO4, and K2Cr2O7 + H2SO4, each have different properties.
  • One of these combinations effectively catalyzes the transformation of primary alcohols into aldehydes.
  • So, the correct response is D) K2Cr2O7 + H2SO4.

Question 21:

What is the correct order of O-H bond cleavage ease in the following compounds?





Topic: O-H Bond Cleavage in Alcohols and Phenols

Correct Answer: C) Phenols > 1° alcohols > 2° alcohols > 3° alcohols

Detailed Hint:
  • The ease of cleavage of the O-H bond varies among different alcohols and phenols.
  • The order of cleavage ease is influenced by the stability of the alkoxide ions and resonance stabilization.
  • The options provided propose different orders for 1°, 2°, 3° alcohols, and phenols, but only one is accurate.
  • So, the correct answer is C) Phenols > 1° alcohols > 2° alcohols > 3° alcohols.

Question 22:

Which compound is identified as 2, 4, 6-Trinitrophenol?





Topic: Nomenclature of Organic Compounds

Correct Answer: B) Picric acid

Detailed Hints:
  • Organic compounds can be identified by their structural features and names.
  • The compound 2, 4, 6-Trinitrophenol has a specific name among the options provided: TNT, Picric acid, Carbolic acid, and Fumaric acid.
  • One option accurately represents the compound 2, 4, 6-Trinitrophenol.
  • Hence, the correct answer is B) Picric acid.

Question 23:

What catalysts are used in Sarrett’s oxidation of alcohols?





Topic: Oxidation of Alcohols using Sarrett’s Reagent

Correct Answer: A) CrO3 & pyridine

Detailed Hints:
  • Different oxidative reactions of alcohols require distinct catalysts, and Sarrett’s oxidation is one such reaction.
  • The options presented are CrO3 & pyridine, CrO3, H2SO4 & acetone, CrO3, pyridine & CH2Cl2, and K2Cr2O7 & H2SO4.
  • Each of these combinations has unique properties, but only one is used in Sarrett’s oxidation of alcohols.
  • Thus, the correct answer is A) CrO3 & pyridine.

Question 24:

What is the order of reactivity of alcohols in esterification?





Topic: Esterification Reactivity of Alcohols

Correct Answer: A) 1o > 2o > 3o

Detailed Hints:
  • Esterification involves the reaction of alcohols and carboxylic acids to produce esters.
  • The order of reactivity for 1o, 2o, and 3o alcohols in this reaction varies.
  • The options provided present different reactivity orders, but only one correctly represents the esterification reactivity of alcohols.
  • So, the correct answer is A) 1o > 2o > 3o.

Question 25:

What is the correct order of boiling point for the given compounds A, B, and C?





Topic: Boiling Points of Organic Compounds

Correct Answer: D) C > B > A

Detailed Hints:
  • The boiling points of organic compounds are influenced by factors such as hydrogen bonding strength, molecular weight, and structural features.
  • The compounds A, B, and C have different boiling point orders.
  • The options A > B > C, C > A > B, B > A > C, and C > B > A represent different boiling point orders, but only one is correct.
  • Therefore, the correct answer is D) C > B > A.

Question 26:

What is the geometry of a carboanion?





Topic: Geometry of Carboanions

Correct Answer: C) Pyramidal

Detailed Hint:
  • Carboanions are species with a negative charge localized on carbon.
  • The geometry of a carboanion is fundamentally determined by its hybridization state.
  • In this case, we consider a carbon atom in a carboanion that is in an sp3 hybridized state.
  • It is covalently bonded to three other atoms, and the remaining negative charge residing on the carbon atom forms an apex of a geometrical figure.
  • The options provided are linear, planar, pyramidal, and tetrahedral, each representing different possible geometries of molecules, but only one is accurate for carboanions.
  • Hence, the correct answer is C) Pyramidal.
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