JEE Chemistry 2026 Question with Solution

Given: Four represented reactions are shown for bromination and diazonium substitution.

Find: Which reaction is NOT correctly represented.

Step 1: Recall reaction types.

• Free radical halogenation occurs at the benzylic position under light $hv$.
• Electrophilic substitution occurs on the aromatic ring in the presence of Lewis acids such as $\mathrm{Fe/FeCl_3}$.
• Sandmeyer reaction converts diazonium salts into aryl halides using copper salts.

Step 2: Analyze each option.

• A: Correct. Radical bromination of toluene at the benzylic position gives benzyl bromide.
• B: Correct. Sandmeyer reaction gives bromobenzene.
• C: Correct. Electrophilic substitution of toluene with $\mathrm{Br_2/Fe}$ in dark gives ortho- and para-bromotoluenes.
• D: Incorrect. This is a repetition of option A, but shown as a separate option. The duplication makes it incorrectly represented in the given set.

Conclusion: Therefore, the correct option is D.

Given: The options test recognition of benzylic bromination, electrophilic aromatic substitution, and Sandmeyer reaction.

Find: The incorrectly represented reaction.

Use the reaction-condition check:

By this check, options A, B, and C match the expected chemistry. The solution states that D is the incorrectly represented entry because it is a duplicated representation of option A rather than a distinct correct reaction.

Therefore, the correct option is D.