Question:

Cannizzaro's reaction is not given by :

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Cannizzaro reaction requires an aldehyde with no alpha-hydrogen.
Updated On: Nov 4, 2026
  • \(\mathrm{CH_3CHO}\)
  • \(\mathrm{HCHO}\)
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The Correct Option is C

Solution and Explanation

Cannizzaro reaction (disproportionation in conc. alkali) is given only by aldehydes lacking alpha-H.
Option 1: benzaldehyde, no alpha-H, gives the reaction.
Option 2: 1-methylcyclohexanecarbaldehyde, the alpha carbon is quaternary (no H), gives the reaction.
Option 4: HCHO has no alpha-H, gives the reaction.
Option 3: \(\mathrm{CH_3CHO}\) has alpha-H (the \(\mathrm{CH_3}\) group), so it undergoes aldol condensation instead.
Answer: (3) \(\mathrm{CH_3CHO}\)
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