MDCAT Chemistry MCQ #539

In the presence of a strong acid, which reaction of benzaldehyde involves the protonation of the carbonyl group?

MDCAT Chemistry MCQ #539

  1. Question 1

    Q1. In the presence of a strong acid, which reaction of benzaldehyde involves the protonation of the carbonyl group?

    • A) Protonation of the aldehyde group to produce a more stable carbocation
    • B) Nucleophilic addition of water to produce a hemiacetal
    • C) Electrophilic aromatic substitution with acetyl chloride
    • D) Protonation of the hydroxyl group to produce an alkyloxonium ion

    Answer: Protonation of the aldehyde group to produce a more stable carbocation

    Explanation: Protonation of the carbonyl group is involved in the reaction mechanism. It fails because nucleophilic addition of water produces a hemiacetal.