Question

Which from following reagents is used to prepare alkyl isocyanides from RX?

• A. AgCN (alco)
• B. \(\text{NH}_3\) (alco)
• C. \(\text{KNO}_2\)
• D. \(\text{AgNO}_2\)

Hint:

Silver cyanide is covalent, so the nitrogen end attacks the carbon and gives the isocyanide.

Answer 1

The Correct Option is A

Step 1: Match product to reagent.
RX + KCN gives RCN (nitrile). RX + AgCN gives RNC (isocyanide). RX + $\text{NH}_3$ gives RNH$_2$. RX + $\text{AgNO}_2$ gives $\text{RNO}_2$.

Step 2: Select.
For alkyl isocyanide the reagent is AgCN, option (A).

Final Answer:
Option (A). \[ \boxed{\text{AgCN (alco)}} \]