question_answer

Which of the following compound gives a ketone with  Grignard reagent              [CPMT 1988; MP PET 1997]

A)                 Formaldehyde 

B)                 Ethyl alcohol

C)                 Methyl cyanide

D)                 Methyl iodide

Correct Answer: C

Solution :

           \[C{{H}_{3}}-C\equiv N+C{{\bar{H}}_{3}}M{{g}^{+}}Br\to C{{H}_{3}}-\underset{C{{H}_{3}}\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C=N}}\,-}}\,MgBr\]                                                                  \[C{{H}_{3}}-CO-C{{H}_{3}}+N{{H}_{3}}+Mg<\begin{matrix}    Br  \\    OH  \\ \end{matrix}\]