question_answer

The following reaction is called Fried el-Crafts reaction. In this reaction X is

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

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

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

D)  \[R-O-R\]

Correct Answer: A

Solution :

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