Free Carboxylic Acids MCQs with Answers
550 Carboxylic Acids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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Read the Carboxylic Acids notesFree MDCAT chapter notes with key terms550 questions · page 15 of 28
- A. Ammonia is strong base than water
- B. Ethanoic acid molecules form H-bonding with water
- C. Ethanoic acid is more soluble in liquid ammonia than in water
- D. None of the above
Explanation: Both water and ammonia can form hydrogen bond, and this is a very strong intermolecular force.
Correct answer: Ammonia is strong base than water- A. Propanedioic acid
- B. Pentane dioic acid
- C. Pentane dicarboxylic acid
- D. Propane dicarboxylic acid
Explanation: d) Propane dicarboxylic acidThis option is correct. Propane dicarboxylic acid has three carbon atoms in its chain and two carboxyl groups…
Correct answer: Pentane dioic acid- A. Oxidation
- B. Reduction
- C. Decarboxylation
- D. Hydrolysis
Explanation: Carboxylic acid and alcohol are derived from fats and oils. Fatty alcohol is usually high molecular weight, straight-chain primary…
Correct answer: Hydrolysis- A. Propionic acid
- B. Formic acid
- C. Butyric acid
- D. Acetic acld
Explanation: A) Propanoic acid has a pungent and rancid odour.B) Formic acid has a pungent and penetrating odour.C) Butyric acid, also known as butter…
Correct answer: Butyric acid285. Salts of carboxylic acids can be converted into corresponding carboxylic acid by treating with:
- A. Water
- B. Base
- C. Acid anhydrides
- D. Acid
Explanation: The appropriate ester on boiling with concentrated sodium hydroxide yields sodium salt of the acid.This resulting salt when treated with…
Correct answer: Acid- A. Aniline
- B. Methyl naphthalene
- C. Carboxyl benzene
- D. Benzene sulphonic acid
Explanation: The correct answer is Option C: Carboxyl benzene. The name 'Carboxyl benzene' is misnamed because the correct nomenclature for a benzene…
Correct answer: Carboxyl benzene- A. Functional isomers
- B. Stereoisomers
- C. Enantiomers
- D. Diastereomers
Explanation: Ethanol and dimethyl ether are functional isomers because they share the same molecular formula, C2H6O, but differ in their functional…
Correct answer: Functional isomers- A. Ethylene
- B. Acetone
- C. Acetaldehyde
- D. Formaldehyde
Explanation: When formaldehyde (CH2O) reacts with methyl magnesium iodide (CH3MgI), followed by acid hydrolysis, it gives ethyl alcohol (ethanol).
Correct answer: Formaldehyde- A. Ethyl formate
- B. Ethyl acetate
- C. Methyl formate
- D. Methyl acetate
Explanation: This is the correct product formed by the reaction between acetic acid and methyl alcohol in the presence of an acid catalyst.
Correct answer: Methyl acetate- A. Electrophilic substitution
- B. Nucleophilic substitution
- C. Electrophilic addition
- D. Nucleophilic addition
Explanation: The carboxyl (COOH) group is named after the carbonyl group (C=O) and a hydroxyl group.
Correct answer: Nucleophilic substitution- A. Hexanoic acid
- B. Octadecanoic acid
- C. Octanoic acid
- D. Hexadecenoic acid
Explanation: Stearic acid is represented by molecular formula C17H35COOH. Since it has 18 carbons (including 1 carbon atom of carboxyl group), it will…
Correct answer: Octadecanoic acid- A. 2,3-dimethyl hexanoic acid
- B. 3,4-dimethyl hexanoic acid
- C. 3,4-dimethyl pentanoic acid
- D. 2,3-dimethyl pentanoic acid
Explanation: Valeric acid is the name for pentanoic acid. α carbon is the carbon attached to the carboxyl group.
Correct answer: 2,3-dimethyl pentanoic acid- A. Benzoic acid
- B. Palmitic acid
- C. Aspartic Acid
- D. Aniline
Explanation: Benzoic acid (C6H5COOH) and palmitic acid (C15H31COOH) are carboxylic acids, while aniline (C6H5NH2) is aromatic hydrocarbon.
Correct answer: Aspartic Acid- A. Carboxyl to carbonyl group
- B. Carboxyl group to an ester group
- C. Carbonyl to carboxyl group
- D. Carboxyl to hydroxyl group
Explanation: This reaction is known as Fischer esterification, where the carboxyl group (-COOH) of a carboxylic acid reacts with an alcohol to form an…
Correct answer: Carboxyl group to an ester group- A. Acetamide
- B. Acid halide
- C. Alcohol
- D. Ester
Explanation: Thionyl chloride (SOCl2) reacts with carboxylic acids to form acid chlorides (RCOCl), also known as acid halides.
Correct answer: Acid halide- A. Hydroxyl group
- B. Terminal hydrogen
- C. Carbonyl group
- D. Alkyl group
Explanation: The reactivity of carboxylic acids is primarily due to the presence of the carbonyl group (C=O) and the acidic hydrogen on the hydroxyl…
Correct answer: Carbonyl group- A. Carboxvlic acid and amino
- B. Amino and aldehyde
- C. Ether and carboxylic acid
- D. Aldehyde and carboxylic acid
Explanation: Amino acids always contain a carboxylic acid (-COOH) group and an amino (-NH2) group
Correct answer: Carboxvlic acid and amino298. If carboxylic acid and ketone groups C=O are present in a chain, then final name will be given as:
- A. oxo, oic acid
- B. one, oic acid
- C. Both 1 and 2
- D. None of these
Explanation: The naming convention for compounds containing both a carboxylic acid group and a ketone group involves using the prefix "oxo" to indicate…
Correct answer: oxo, oic acid- A. It decomposes on increasing temperature
- B. It has less degree of ionization
- C. It has -COOH group
- D. It has more inductive effect
Explanation: Acetic acid is weaker than sulfuric acid because it has a lesser degree of ionization.
Correct answer: It has less degree of ionization- A. CH₃COCI + SO₂ + HCl
- B. CH3CI + CH3COCI
- C. CH3COOCH3 + SO2
- D. CH₃CI + SO₂ + HCI
Explanation: The correct product obtained when acetic acid reacts with thionyl chloride is A.
Correct answer: CH₃COCI + SO₂ + HCl