question_answer

Which of the following compounds gives a ketone with Grignard reagent?

A)  Formaldehyde

B)  Ethyl alcohol

C)  Methyl cyanide

D)  Methyl iodide

Correct Answer: C

Solution :

\[R.Mg\,X+R-C\equiv N\to R-\overset{O}{\mathop{\underset{R}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,=\left| \underset{H}{\mathop{\overset{{{H}_{2}}}{\mathop{N}}\,}}\,- \right|\underset{OH}{\mathop{MgX}}\,\] Grignard reagent reacts with alkyi cyanide (methyl cyanide) and gives ketone.