| Identify the products [A] and [B] in the reactions. |
| \[RX+AgCN\to (A)+AgX\]; |
| \[RX+KCN\to (B)+KX\] |
A) \[(A)\to RCN,\,(B)\to RCN\]
B) \[(A)\to RCN,\,(B)\to RNC\]
C) \[(A)\to RNC,\,(B)\to RCN\]
D) \[(A)\to RNC,\,(B)\to RNC\]
Correct Answer: C
Solution :
\[RX+AgCN\to \underset{(A)}{\mathop{RNC}}\,+AgX\] \[RX+KCN\to \underset{(B)}{\mathop{RCN}}\,+KX\] Both C and N can donate electron pairs. Since KCN is predominantly ionic and C-C bond is more stable than C-N bond in case of KCN, attack takes place through carbon atom. AgCN is predominantly covalent hence only nitrogen pair is available for bonding resulting in formation of isocyanide.
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