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 19 of 28
- A. Butanoic acid
- B. Pentanoic acid
- C. Propanoic acid
- D. HCI
Explanation: The highest melting point is observed in option 2) Pentanoic acid. Boiling point of carboxylic acids increase with increasing molar mass…
Correct answer: Pentanoic acid- A. Ethyl alcohol
- B. Acetamide
- C. Acetyl chloride
- D. Methyl cyanide
Explanation: From Alkanenitriles: Compounds having a cyanide ( - C ≡ N) group are called nitriles.Hydrolysis of an alkanenitrile on boiling with…
Correct answer: Acetamide- A. water
- B. Propanoic acid
- C. Methanoic acid
- D. Ethanoic acid
Explanation: Though methanoic acid and ethanoic acid both form strong hydrogen bonds and exist as dimers in the solid state, ethanoic acid has better…
Correct answer: Propanoic acid- A. Bigger molecules are more polar
- B. bigger molecules have bigger non-polar groups
- C. bigger molecules make more hydrogen bonds
- D. bigger molecules can form lesser hydrogen bonds/molecule
Explanation: The correct explanation for the decrease in solubility of carboxylic acids in water with an increase in molar mass is that the bigger…
Correct answer: bigger molecules have bigger non-polar groups- A. SN
- B. AN
- C. SE
- D. AE
Explanation: The correct mechanism involved in the formation of acetic anhydride from acetic acid is A) SN (Substitution Nucleophilic).
Correct answer: SN- A. carboxylic acid
- B. proton
- C. phenoxide ion
- D. Carboxylate ion
Explanation: Option D correctly identifies the reason for the higher acidity of carboxylic acids.
Correct answer: Carboxylate ion- A. 64
- B. 46
- C. 32
- D. 92
Explanation: Option D is the correct molar mass of formic acid (HCOOH) in benzene. To calculate the molar mass, we add the atomic masses of each…
Correct answer: 92- A. formic acid
- B. oxalic acid
- C. propionic acid
- D. acetic acid
Explanation: Option C is the correct answer.When ethyl magnesium bromide (ethyl Grignard reagent) reacts with carbon dioxide (CO2) in the presence of a…
Correct answer: propionic acid- A. 90°
- B. 180°
- C. 60°
- D. 120°
Explanation: Sp2 hybridizationThe correct bond angle between the alkyl group and the hydroxyl group in a carboxylic acid molecule is D) 120°.
Correct answer: 120°- A. Acetic acid
- B. Formic acid
- C. Propionic acid
- D. Valeric acid
Explanation: The correct answer is B) Formic acid.The boiling points of carboxylic acids are relatively high due to intermolecular hydrogen…
Correct answer: Formic acid- A. Methyl formate
- B. Methyl acetate
- C. None of these
- D. Ethyl formate
Explanation: Ethyl formate is the correct ester that can be hydrolyzed to produce ethyl alcohol.
Correct answer: Ethyl formate- A. Acetic acid
- B. Formic acid + Acetic acid
- C. Formic acid
- D. Propionic acid
Explanation: The correct answer is B) Formic acid (HCOOH) and Acetic acid (CH3COOH).
Correct answer: Formic acid + Acetic acid- A. Ethane
- B. Ethanoic acid
- C. Ethanol
- D. Ethyl ethanoate
Explanation: Option A is gas. Options B and C are totally miscible in H20 (through hydrogen bonding with H20).
Correct answer: Ethyl ethanoate- A. n-Butyric acid
- B. Formic acid
- C. N-acetic acid
- D. Propanoic acid
Explanation: This option A is correct as it Butyric Acid contain 4 Carbon atoms.Trivial names and common names are the same for carboxylic acids.
Correct answer: n-Butyric acid- A. Aromatic compounds
- B. Alcohols
- C. Carboxylic acids
- D. Ethers
Explanation: Carboxylic acid is obtained by treating Grignard's reagent with CO2 followed by acid hydrolysis.
Correct answer: Carboxylic acids- A. Chlorine releases electrons and destabilizes ClCH2COO- anion
- B. Chlorine releases electrons and stabilizes the ClCH2COO- anion
- C. Chlorine withdraws electrons destabilizes ClCH2COO- anion
- D. Chlorine withdraws electron and stabilizes the ClCH2COO- anion
Explanation: The general equation is: HA--> H++A- When A- formed is more stable, the equlibrium lies more to the right.More HA dissociates and hence it…
Correct answer: Chlorine withdraws electron and stabilizes the ClCH2COO- anion- A. Acid halide
- B. Acid amide
- C. Ester
- D. Acid anhydride
Explanation: Because when carboxylic acid is treated with ammonia, first of all ammonium salt of carboxylic acid is formed which on heating produces…
Correct answer: Acid amide- A. 2-Methyl-2-propanol
- B. 1-Butanol
- C. 2-Butanol
- D. 2-Propanol
Explanation: 2-Methyl-2-propanol: This is a tertiary alcohol (3° alcohol), as the carbon bearing the hydroxyl group (OH) is attached to three other…
Correct answer: 2-Methyl-2-propanol- A. CH3CH2NH2
- B. CH3-C||O-NH2
- C. NH2-C||O-NH2
- D. CH3-C||O-OH
Explanation: CH3-CN+H2O H+→H2O CH3-C||O-NH2 H+→H2Ọ CH3COOH
Correct answer: CH3-C||O-NH2- A. Hydration
- B. Esterification
- C. Hydrolysis
- D. Salt formation
Explanation: Artificial flavours are derived from esters and reaction between acid and alcohol is called esterification.
Correct answer: Esterification