question_answer

\[C{{H}_{3}}C{{H}_{2}}-\underset{\begin{smallmatrix}  | \\  Ph \end{smallmatrix}}{\overset{\begin{smallmatrix}  OH \\  | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}}\] cannot be prepared by [JEE Main Online Paper Held On 12-Jan-2019 Morning]

A) \[PhCOC{{H}_{3}}+C{{H}_{3}}C{{H}_{2}}MgX\]

B) \[HCHO+PhCH(C{{H}_{3}})C{{H}_{2}}MgX\]

C) \[PhCOC{{H}_{2}}C{{H}_{3}}+C{{H}_{3}}MgX\]

D) \[C{{H}_{3}}C{{H}_{2}}COC{{H}_{3}}+PhMgX\]

Correct Answer: B

Solution :