allery**Clemmensen reduction** converts C=O of a ketone to CH₂ using:
AZn-Hg amalgam in concentrated HCl
BLiAlH₄ in ether
CH₂/Pt (catalytic hydrogenation)
DNaBH₄ in methanol
Answer & Solution
Correct answer: A. Zn-Hg amalgam in concentrated HCl
**Clemmensen reduction**: C=O → CH₂ using **Zn-Hg / conc.
HCl** (acidic conditions).
Useful when there are NO acid-sensitive groups in the substrate.
**Wolff-Kishner reduction** (NH₂NH₂ / KOH / ethylene glycol, hot) does the same conversion under **basic** conditions — for acid-sensitive substrates.
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