JEE Advanced Aldehydes, Ketones and Carboxylic Acids — practice questions — page 5

Explore 122 free Aldehydes, Ketones and Carboxylic Acids questions in JEE Advanced Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Aldehydes, Ketones and Carboxylic Acids questions and exercises with answers

Showing questions 121–122 of 122.

Match each named organic reaction to its description.Read the answer and worked solution →Which of the following named reactions does **NOT** require an $\alpha$-hydrogen on the substrate?Read the answer and worked solution →

Worked practice questions

Match each named organic reaction to its description.

Read exercise and reference answers

Matching pairs

Left
Aldol condensation
Right
α-H aldehyde → β-hydroxy aldehyde (base)
Left
Cannizzaro
Right
No α-H aldehyde → acid + alcohol (base)
Left
Hoffmann bromamide
Right
1° amide → 1° amine (Br₂/KOH)

Instructions

Pair the reaction with what it does.

_Source: syllabus Chemistry, Ch 12 'Aldehydes, Ketones and Carboxylic Acids' §12.4_

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Which of the following named reactions does NOT require an $\alpha$-hydrogen on the substrate?

HVZ reaction
Cross-aldol condensation
Aldol condensation
Cannizzaro reaction

Show answer and solution

Correct answer: D. Cannizzaro reaction

Cannizzaro is the *exception*: it operates only on aldehydes without $\alpha$-H. Aldol, HVZ, and cross-aldol all require enolisable $\alpha$-H. This is a popular JEE trap.

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