The Clemmensen reduction uses which reagent to reduce acarbonyl group to a methylene group?
Correct answer: C. Zn(Hg) and conc. HCl
- A. LiAlH₄
- B. H₂/Pd
- C. Zn(Hg) and conc. HCl
- D. N₂H₄, KOH/ethylene glycol
Explanation
The Clemmensen reduction is a specific chemical reaction used to reduce aldehydes or ketones to alkanes (C=O →CH₂). It is carried out using zinc amalgam [Zn(Hg)] in the presence of concentrated hydrochloric acid.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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