question_answer

The following reaction is called Friedel-Craft's reaction. In this reaction ?X? is

A) \[R-\underset{O}{\mathop{\underset{|\,|}{\mathop{C}}\,}}\,-Cl\]

B) \[R-\underset{O}{\mathop{\underset{|\,|}{\mathop{C}}\,}}\,-R\]

C) \[R-\underset{O}{\mathop{\underset{|\,|}{\mathop{C}}\,}}\,-H\]                         

D) \[R-O-R\]

Correct Answer: A

Solution :

In Friedel-Craft's reaction, either an acyl \[(RCOCl)\] or an alkyl halide attacks on benzene ring in the presence of anhydrous \[\text{AlC}{{\text{l}}_{\text{3}}}\text{.}\]Hence, X must be \[R-\underset{\text{O}}{\mathop{\underset{||}{\mathop{C}}\,}}\,-Cl\]in this reaction .