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R-CHO+4[H]overset(Zn-Hg//conc.HCl.)to R-...

`R-CHO+4[H]overset(Zn-Hg//conc.HCl.)to R-CH_(3)+H_(2)O` is

A

Wurtz reaction

B

Clemmenson'reduction

C

Wolf- Kishner reduction

D

Friedel -Craft'

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