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 11 of 28
- A. Chloroethanoic acid
- B. Ethanoic acid
- C. Trichloroethanoic acid
- D. Dichloroethanoic acid
Explanation: Chloro groups cause an inductive effect(-I). i.e it is a withdrawing group because it is more electronegative than carbon to which it is…
Correct answer: Trichloroethanoic acid202. Which one of the following compounds act as a catalyst when alcohols react with carboxylic acids.
- A. Pt
- B. Conc. HNO3
- C. Ni
- D. Conc. H2SO4
Explanation: When a carboxylic acid is treated with an alcohol and an acid catalyst (Conc H2SO4), an ester is formed (along with water).
Correct answer: Conc. H2SO4- A. Alkane
- B. Ether
- C. Aldehyde
- D. Ester
Explanation: When primary alcohol is treated with a carboxylic acid in the presence of sulphuric acid a compound is formed.
Correct answer: Ester- A. Distillation
- B. Fermentation
- C. Dehydration
- D. Ozonolysis
Explanation: Production of acetic acid can be carried out by aerobic and anaerobic fermentation.
Correct answer: Fermentation- A. Amide
- B. Carbonic acid
- C. Ketone
- D. Aldehyde
Explanation: Carboxylic acids are only formed through the oxidation of primary alcohols.
Correct answer: Aldehyde- A. Ethanoic acid
- B. Hexanedioic acid
- C. Butanedioic acid
- D. Propanoic acid
Explanation: Succinic Acid is also known as butanedioic acid. As there are 4 carbons, and 2 carboxylic groups, its IUPAC name will be butanedioic acid.
Correct answer: Butanedioic acid- A. Red litmus blue
- B. Blue litmus red
- C. Neutral to litmus
- D. No effect
Explanation: Correct option is B.The carboxylic acid turns blue litmus red because the hydroxyl group present in -COOH is far more acidic than in…
Correct answer: Blue litmus red- A. Ethene
- B. None of these
- C. Ether
- D. Esters
Explanation: Esters are colorless chemical compounds with a sweet odor and fruity smell, so they're used as artificial flavors and fragrances.
Correct answer: Esters- A. Acid anhydride
- B. Acid halide
- C. Carbonic acid
- D. Salts
Explanation: The reaction of carboxylic acids with bases gives carboxylate salts. The hydrogen of the -OH group is replaced with a metal cation.
Correct answer: Salts- A. Formic acid
- B. Oxalic acid
- C. Benzoic acid
- D. Acetic acid
Explanation: Acetic acid (CH3COOH), formic acid (HCOOH), and benzoic acids (C6H5COOH) are all monocarboxylic acids as they contain only one carboxylic…
Correct answer: Oxalic acid- A. Acetate
- B. Alcohol
- C. All of them
- D. Esters
Explanation: Reduction of carboxylic acid (RCOOH) yields an aldehyde (RCH=O), followed by further reduction into alcohol (RCOH).
Correct answer: All of them- A. Propanedioic acid
- B. Ethanoic acid
- C. Ethanedioic acid
- D. Butanoic acid
Explanation: Oxalic acid is a 2-C dicarboxylic acid, which means it has two carboxyl groups attached to each other.
Correct answer: Ethanedioic acid- A. Fast
- B. Moderate
- C. Slow
- D. None of these
Explanation: Fisher esterification is a reversible reaction that proceeds very slowly.
Correct answer: Slow- A. Adipic acid
- B. Oxalic acid
- C. Phthalic acid
- D. Succinic acid
Explanation: Adipic acid is hexanedioic acid. It is a dicarboxylic acid with two carboxyl groups at the terminal ends of a six-carbon chain.
Correct answer: Adipic acid- A. Smaller size
- B. Larger size
- C. Hydrogen bonding
- D. London dispersion forces
Explanation: The molecules of carboxylic acids exhibit hydrogen bonding. Two molecules of carboxylic acid make two hydrogen bonds with each other.
Correct answer: Hydrogen bonding- A. 2-aminopropanoic acid
- B. 2-hydroxypropanoic acid
- C. 2-aminoethanoic acid
- D. Ethane-1,2-diol
Explanation: The IUPAC name of glycine is 2-aminoethanoic acid. 2-aminopropanoic acid is the IUPAC name for alanine.
Correct answer: 2-aminoethanoic acid- A. K2Cr2O7
- B. P2O5
- C. H+/H2O
- D. H2SO4
Explanation: Phosphorous pentoxide is used to condense carboxylic acids to acid anhydrides.
Correct answer: P2O5- A. Formic acid
- B. Acetic acid
- C. Benzoic acid
- D. Amino acid
Explanation: Option A: Formic acid is a carboxylic acid with the chemical formula HCOOH. It is a colorless liquid with a pungent odor.
Correct answer: Acetic acid- A. Acetic acid
- B. Butanoic acid
- C. Benzoic acid
- D. No reaction takes place
Explanation: Option A: When ethyl alcohol undergoes oxidation with potassium dichromate, it is converted into acetic acid.
Correct answer: Acetic acid- A. Substituent
- B. Parent
- C. Benzoic acid
- D. Both b and c
Explanation: In aromatic Carboxylic acids, the COOH group is named as a parent as it has a high level of precedence in naming.
Correct answer: Both b and c