Which of the following reactions represents Clemmensen reduction?

$\mathrm{R}-\mathrm{CN} \xrightarrow[\mathrm{H}_3 \mathrm{O}^{+}]{\mathrm{SnCl}_2, \mathrm{HCl}} \mathrm{R}-\mathrm{CHO}+\mathrm{NH}_4 \mathrm{Cl}$
$\mathrm{R}-\mathrm{CHO} \xrightarrow[\Delta]{\mathrm{Zn} \mathrm{Hg}, \text {Conc. HCl }} \mathrm{R}-\mathrm{CH}_3+\mathrm{H}_2 \mathrm{O}$
$\mathrm{R}-\mathrm{CO}-\mathrm{R} \xrightarrow[\text { (ii) } \mathrm{KOH}, \Delta \mathrm{HO}-\left(\mathrm{CH}_2\right)_2-\mathrm{OH}]{\text { (i) } \mathrm{O}_2 \mathrm{~N}-\mathrm{NH}_2} \mathrm{R}-\mathrm{CH}_2-\mathrm{R}$

Solution

Clemmensen Reduction Reaction

Asked in: MHT CET 2024 (02 May Shift 2)