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 7 of 28
- A. Capric acid
- B. Enanthic acid
- C. Butyric Acid
- D. Formic acid
Explanation: Butyric acid, also known as butanoic acid, is a short-chain fatty acid that is found in butter and other dairy products.
Correct answer: Butyric Acid- A. Alcohols
- B. Aldehydes
- C. Ketones
- D. Ethers
Explanation: Tollen's reagent is a mild oxidizing agent that selectively. oxidizes aldehydes to carboxylate anions, which are then protonated to form…
Correct answer: Aldehydes- A. CHO-Na+
- B. CHOO-Na+
- C. CH3CO-Na+
- D. CH3COO-Na+
Explanation: This is a standard acid-base neutralization reaction. The acidic proton of the carboxylic acid (CH3COOH) is removed by the hydroxide base…
Correct answer: CH3COO-Na+- A. Acid anhydride
- B. Carboxylate anion
- C. Phenoxide
- D. Protic acid
Explanation: Saponification is the base-catalyzed hydrolysis of an ester. The hydroxide ion attacks the carbonyl carbon, cleaving the ester bond to…
Correct answer: Carboxylate anion- A. Ethane
- B. Ethanoic acid
- C. Ethanol
- D. Ethyl ethanoate
Explanation: Ethyl ethanoate is an ester, which is a liquid at room temperature and is not readily soluble in water.
Correct answer: Ethyl ethanoate- A. Chlorine releases electrons and destabilizes ClCH2CO2- anion
- B. Chlorine releases electrons and stabilizes the ClCH2CO2- anion
- C. Chlorine withdraws electrons and destabilizes ClCH2CO2- anion
- D. Chlorine withdraws electrons and stabilizes the ClCH2CO2- anion
Explanation: The strength of an acid is determined by the stability of its conjugate base.
Correct answer: Chlorine withdraws electrons and stabilizes the ClCH2CO2- anion- A. Ethanoyl chloride + SO2 + HCl
- B. Ethanoyl chloride + SO3
- C. Ethanoyl chloride + HCl + H2SO3
- D. Ethanoyl chloride + HCl + H2SO4
Explanation: Thianyl chloride (SOCI2) is a common reagent used to convert carboxylic acids into acyl chlorides.
Correct answer: Ethanoyl chloride + SO2 + HCl- A. n-Butyric acid
- B. Formic acid
- C. Caproic acid
- D. Propanoic acid
Explanation: Butyric acid is the common (trivial) name for the four-carbon carboxylic acid, butanoic acid.
Correct answer: n-Butyric acid- A. Aldehydes
- B. Esters
- C. Carboxylic acids
- D. Ketones
Explanation: Esters organic compounds known for their characteristically pleasant, often fruity or sweet, smells and tastes.
Correct answer: Esters130. By treating CO2 with Grignards's reagent, followed by acid hydrolysis which compound is obtained?
- A. Aromatic compounds
- B. Alcohols
- C. Carboxylic acids
- D. Ethers
Explanation: The Grignard reagent acts as a strong nucleophile and attacks the electrophilic carbon of carbon dioxide.
Correct answer: Carboxylic acids- A. Acetic acid
- B. Ketone
- C. Alcohol
- D. Phenol
Explanation: The controlled oxidation of ethyl alcohol (a primary alcohol) first yields acetaldehyde.
Correct answer: Acetic acid132. Acetic acid is:
- A. Methanoic acid
- B. Ethanoic acid
- C. Propanoic acid
- D. None of these
Explanation: Acetic acid is the common name for the carboxylic acid. containing two carbon atoms. Its systematic IUPAC name is ethanoic acid.
Correct answer: Ethanoic acid- A. Polar nature
- B. Attached alkyl group
- C. Resonance
- D. Symmetrical structure
Explanation: The carbonyl group of ketones & aldehydes is more. electrophilic than in carboxylic acids.
Correct answer: Resonance- A. Acid amide
- B. Acid halide
- C. Ester
- D. Acid anhydride
Explanation: The reactivity of carboxylic acid derivatives is determined by the leaving group ability of the group attached to the carbonyl.
Correct answer: Acid halide- A. CnH2nO3
- B. CnHnO2
- C. CnH2nO2
- D. CnH2nO
Explanation: A saturated alkyl group has the formula Cn-1H2n-1. Adding the -COOH group to this gives a total formula of CnH2nO2, which correctly…
Correct answer: CnH2nO2- A. Presence of hydrogen at α-carbon
- B. Condensation reaction
- C. Presence of carboxyl group
- D. Hydrogen bonding
Explanation: In non-polar solvents like benzene, two molecules of acetic acid can form a stable, hydrogen-bonded dimer.
Correct answer: Hydrogen bonding- A. LiAlH4
- B. LiAlH4.H2O
- C. Mg(BH4)2
- D. All of the above
Explanation: LiAlH4 is a strong reducing agent that can reduce carboxylic acids to primary alcohols like butanol.LiAlH4.H₂O is used only to quench the…
Correct answer: LiAlH4- A. Carbolic acid
- B. Picric Acid
- C. Carbonic Acid
- D. Palmitic acid
Explanation: Palmitic acid is a long-chain saturated fatty acid, which is a type of carboxylic acid.
Correct answer: Palmitic acid- A. Benzoic Acid
- B. Benzene
- C. Toluene
- D. Benzaldehyde
Explanation: Sodium benzoate undergoes decarboxylation when heated with soda lime (NaOH + CaO).
Correct answer: Benzene- A. Organic
- B. Phenol
- C. Alcohol
- D. Mineral acids
Explanation: The hydrolysis of a nitrile (R-CN) to a carboxylic acid (R-COOH) is typically carried out by heating with a strong aqueous acid, such as a…
Correct answer: Mineral acids