question_answer

 Product is:

A)  

B) \[Me-\overset{\overset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-\overset{\overset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-Ph\]

C) \[Me-\overset{\overset{OH}{\mathop{|}}\,}{\mathop{\underset{\underset{Ph}{\mathop{|}}\,}{\mathop{C}}\,}}\,-COOH\]

D) \[Ph-\overset{\overset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-\overset{\overset{O}{\mathop{\parallel }}\,}{\mathop{C}}\,-O-Me\]

Correct Answer: C

Solution :

[C] \[Ph-\underset{\underset{M}{\mathop{|}}\,}{\mathop{\overset{\overset{OMgB}{\mathop{|}}\,}{\mathop{C}}\,}}\,-\underset{\underset{o}{\mathop{\parallel }}\,}{\mathop{C}}\,-OMgBr\xrightarrow{H\oplus /{{H}_{2}}o}Ph-\underset{\underset{Me}{\mathop{|}}\,}{\mathop{\overset{\overset{OH}{\mathop{|}}\,}{\mathop{C}}\,}}\,-COOH\]