Answer

Correct option: C.
$R \mathrm{CHO} \xrightarrow[\Delta]{\mathrm{Zn}-\mathrm{Hg} \text {, conc } \mathrm{HCl}} R \mathrm{CH}_3+\mathrm{H}_2 \mathrm{O}$
(c) : $R CHO \xrightarrow{ Zn - Hg , \text { conc. } HCl } R CH _3+ H _2 O$
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