A) KNC
B) AgNC
C) KCN
D) AgCN
Correct Answer: D
Solution :
Key Idea: Alkyl cyanide is prepared by reaction between alkyl halide KCN but alkyl halide on reaction with \[AgCN\] form alkyl isocyanide. \[\underset{alkyl\text{ }halide}{\mathop{R\,\,X\,\,+}}\,\,\,\,\,\underset{silver\text{ }cyanide}{\mathop{AgCN\to }}\,\,\,\,\underset{iso-cyanida}{\mathop{R\overset{\to }{\mathop{=}}\,NC+}}\,Ag\,X\]
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