Which among the following reactions does not occur?

Which among the following reactions does not occur?
  2. $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+\mathrm{AgCN} \rightarrow \mathrm{C}_2 \mathrm{H}_5 \mathrm{NC}+\mathrm{AgBr}$
  3. $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+\mathrm{KCN} \rightarrow \mathrm{C}_2 \mathrm{H}_5 \mathrm{NC}+\mathrm{KBr}$
  4. $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+\mathrm{KNO}_2 \rightarrow \mathrm{C}_2 \mathrm{H}_5-\mathrm{O}-\mathrm{N}=\mathrm{O}+\mathrm{KBr}$

Solution

$\mathrm{C}_2 \mathrm{H}_5-\mathrm{Br}+\underset{\text { (Ionic) }}{\mathrm{KCN}} \rightarrow \underset{\text { (Cyanide) }}{\mathrm{C}_2 \mathrm{H}_5}-\mathrm{C} \equiv \mathrm{N}+\mathrm{KBr}$

Asked in: MHT CET 2022 (07 Aug Shift 1)

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