Question

Identify major product "X" formed in the following reaction :

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

Answer 2

The reaction is the Gattermann–Koch reaction , which involves the formylation of benzene to produce benzaldehyde ($C_6H_5CHO$). In the presence of carbon monoxide (CO), hydrogen chloride (HCl), and anhydrous AlCl$_3$/CuCl, the formyl group (CHO) is introduced into the benzene ring.

$C_6H_6 + CO + HCl \xrightarrow{\text{AlCl}_3/\text{CuCl}} C_6H_5CHO$

Thus, the major product $X$ is benzaldehyde (3).
Thus the correct answer is Option 3.