Question

For the reaction:

Product (P) is

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is A

The Gattermann–Koch reaction involves the formylation of aromatic compounds using carbon monoxide and hydrochloric acid in the presence of a Lewis acid catalyst, typically aluminum chloride (AlCl₃). It is primarily used to introduce a formyl group (-CHO) into the benzene ring.

In the given reaction, benzene reacts with CO and HCl in the presence of AlCl₃ to produce benzaldehyde. The mechanism involves the formation of an acylium ion (CHO⁺), which acts as an electrophile and attacks the benzene ring to form the formylated product.

Let's examine the options presented:

1. The correct product of the Gattermann–Koch reaction for benzene is benzaldehyde (C₆H₅CHO).
2. Other options represent different products that do not result from this specific reaction.

Therefore, the correct answer is:

The product is benzaldehyde (C₆H₅CHO), which matches the Gattermann–Koch reaction's expected outcome.