Question

Assertion (A): Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene. Reason (R): Alkyl halides are less reactive than acyl halides. In the light of above statements, choose the most appropriate answer from the options given below

Options

• If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

• If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

• If the Assertion is correct but Reason is incorrect.

• If both the Assertion and Reason are incorrect.

Answer 1

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

Explanation: 

Alkyl benzene can be prepared by reacting benzene with alkyl halide in the presence of a Lewis acid such as AICl₃/FeBr₃. So, the assertion is correct. Acyl halide is more reactive than alkyl halide due to the formation of reactive acylium carbocation, so the reason is also correct, but the reason is not the correct explanation of the assertion.