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 2 of 28
- A. Condensation
- B. Substitution
- C. Elimination
- D. Dehydrogenation
Explanation: A carboxylic acid and an alcohol join with the loss of a small molecule, water, which is the definition of a condensation, and…
Correct answer: Condensation- A. Carbonates
- B. Alkane
- C. Ester
- D. Amide
Explanation: The ammonium carboxylate loses a molecule of water on strong heating and the nitrogen ends up bonded directly to the carbonyl carbon…
Correct answer: Amide- A. Formose
- B. Fructose
- C. Maltose
- D. Xylose
Explanation: In the presence of calcium hydroxide, formaldehyde molecules undergo condensation to form sugars, producing a mixture called formose.
Correct answer: Formose- A. Methanol
- B. Glycol
- C. Glycerol
- D. Sodium hydroxide
Explanation: Saponification is the alkaline hydrolysis of fats or oils, which are esters of glycerol; the reaction produces soap and glycerol.
Correct answer: Glycerol- A. isobutyl formate
- B. octyl acetate
- C. ethyl butyrate
- D. amyl lactate
Explanation: Octyl acetate is an ester with a characteristic orange-like flavour, which is why it is used in flavouring materials.
Correct answer: octyl acetate- A. amyl acetate
- B. sodium butyrate
- C. isobutyle formate
- D. octyl acetate
Explanation: Sodium butyrate is an ionic salt formed from butanoic acid and sodium, so it does not contain the ester linkage R-COO-R.
Correct answer: sodium butyrate- A. ethanol
- B. acetic acid
- C. ethanol and acetic acid
- D. ethanol and sodium acetate
Explanation: In basic hydrolysis, ethyl acetate reacts with sodium hydroxide: CH3COOC2H5 + NaOH -> CH3COONa + C2H5OH.
Correct answer: ethanol and sodium acetate- A. Acid
- B. Alkali
- C. Enzyme and alkali
- D. Enzyme and acid
Explanation: Saponification is the alkaline hydrolysis of fats or oils, which are esters, producing glycerol and the alkali-metal salts of fatty acids…
Correct answer: Alkali- A. this acid, in ancient times, was used to eliminate ant-hills
- B. this corrosive acid is secreted by ants to drive away their enemies
- C. this acid was first obtained by the distillation of ants
- D. ants are attracted by the odour of this acid
Explanation: Formic acid was historically obtained by distilling ants, which explains its name from the Latin word formica meaning ant.
Correct answer: this acid was first obtained by the distillation of ants- A. CO2
- B. CH3CHO
- C. COC2
- D. HCN
Explanation: A Grignard reagent reacts with carbon dioxide to form a magnesium carboxylate, which gives a carboxylic acid after acidic hydrolysis: RMgX…
Correct answer: CO2- A. propane
- B. propanoic acid
- C. propanal
- D. propanol
Explanation: Ethyl magnesium iodide adds to CO2 to form a magnesium carboxylate, and acid hydrolysis converts this intermediate into CH3CH2COOH…
Correct answer: propanoic acid- A. carboxylation
- B. decarboxylation
- C. esterification
- D. hydroxylation
Explanation: Decarboxylation is the removal of carbon dioxide, CO2, from a carboxylic acid or its salt, often on heating with soda lime.
Correct answer: decarboxylation- A. esterification
- B. neutralization
- C. hydrolysis
- D. saponification
Explanation: A carboxylic acid reacts with an alcohol in the presence of concentrated H2SO4 to form an ester and water: RCOOH + R'OH ⇌ RCOOR' + H2O.
Correct answer: esterification- A. proteins and oild
- B. fats and proteins
- C. fats and oils
- D. all above
Explanation: Fats and oils are esters of glycerol with long-chain carboxylic acids. Hydrolysis breaks these ester bonds and produces glycerol plus…
Correct answer: fats and oils- A. Acetic acid
- B. Formic acid
- C. Butanoic acid
- D. Citric acid
Explanation: Ethanol is oxidized first to ethanal and then to acetic acid: CH3CH2OH + 2[O] → CH3COOH + H2O.
Correct answer: Acetic acid- A. Oxalic acid
- B. Aromatic acid
- C. Malonic acid
- D. Fumaric acid
Explanation: Propane-1,3-dioic acid has two carboxyl groups on a three-carbon chain, so its accepted common name is malonic acid.
Correct answer: Malonic acid- A. Acetic acid
- B. Formic acid
- C. Carbonic acid
- D. Benzoic acid
Explanation: Acetic acid is used in the manufacture of synthetic rubber as an industrial raw material and processing chemical in the relevant textbook…
Correct answer: Acetic acid- A. Oxalic acid
- B. Succinic acid
- C. Adipic acid
- D. Acetic acid
Explanation: Oxalic acid is used to remove ink stains because it acts as a reducing and complexing agent, helping dissolve coloured metal-containing…
Correct answer: Oxalic acid- A. Oxalic acid
- B. Succinic acid
- C. Malonic acid
- D. Fumaric acid
Explanation: Propane-1,3-dioic acid has three carbon atoms with carboxyl groups at both ends, HOOC-CH2-COOH, whose common name is malonic acid.
Correct answer: Malonic acid- A. Carboxylic acid
- B. Ethanoic acid
- C. Propanoic acid
- D. Butanoic acid
Explanation: A Grignard reagent reacts with carbon dioxide to form a magnesium carboxylate, and acid hydrolysis gives a carboxylic acid with one extra…
Correct answer: Propanoic acid