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The major product X formed in the following reaction sequence is:
A
- 
B
- 
C
- 
D
- 
Detailed Solution
$Cl_2/FeCl_3$ chlorinates the ring ortho to the $-NO_2$ group (A); $Sn/HCl$ reduces $-NO_2$ to $-NH_2$ (B); $NaNO_2/HCl$ at $274$-$278$ K converts $-NH_2$ to a diazonium salt (C); reaction of the diazonium salt with KI replaces $-N_2^+$ with $-I$, giving the major product X with $Cl$ and $I$ substituents on the ethyl-substituted benzene ring.