Which of the following conversions need the reagent $\mathrm{Sn} / \mathrm{HCl}$ ?

Which of the following conversions need the reagent $\mathrm{Sn} / \mathrm{HCl}$ ?
  1. $\mathrm{R}-\mathrm{CO}-\mathrm{NH}_2 \rightarrow \mathrm{R}-\mathrm{CH}_2-\mathrm{NH}_2$
  2. $\mathrm{R}-\mathrm{C} \equiv \mathrm{N} \rightarrow \mathrm{R}-\mathrm{CH}_2-\mathrm{NH}_2$
  3. $\mathrm{R}-\mathrm{NO}_2 \rightarrow \mathrm{R}-\mathrm{NH}_2+2 \mathrm{H}_2 \mathrm{O}$
  4. $\mathrm{R}-\mathrm{CO}-\mathrm{HN}_2 \rightarrow \mathrm{R}-\mathrm{NH}_2$

Solution

$\mathrm{R}-\mathrm{NO}_2 \stackrel{\mathrm{Sn} / \mathrm{HCl}}{\longrightarrow} \mathrm{R}-\mathrm{NH}_2+2 \mathrm{H}_2 \mathrm{O}$

Asked in: MHT CET 2022 (07 Aug Shift 2)

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