Question

Which of the following reaction does not take place?

• A. $C_{2}H_{5}Br + KNO_{2} \rightarrow C_{2}H_{5} - O - N = O + KBr$
• B.
• C. $C_{2}H_{5}Br + Ag ⥂ CN \rightarrow C_{2}H_{5}NC + AgBr$
• D. $C_{2}H_{5}Br + KCN \rightarrow C_{2}H_{5}NC + KBr$

Answer 1

Answer: (D)

$C_{2}H_{5}Br + KCN \rightarrow C_{2}H_{5}NC + KBr$

Answer 2

$C_{2}H_{5}Br + KCN \rightarrow C_{2}H_{5}CN + KBr$

Due to ionic nature, the attack by $CN^{-}$occurs through C atom and alkyl cyanide is formed.