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Which of the following named reactions does **NOT** require an $\alpha$-hydrogen on the substrate?
AHVZ reaction
BCross-aldol condensation
CAldol condensation
DCannizzaro reaction
Answer & 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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