Which is nor the correct synthesis of m-bromonitrobenzene?

Synthesis of m-Bromonitrobenzene

Correct Synthesis Routes

1. Bromination of Nitrobenzene

The nitro group (–NO₂) is a strong meta-directing deactivator. Brominating nitrobenzene with Br₂/FeBr₃ yields mainly m-bromonitrobenzene.

2. Indirect Multi-Step Routes

Starting from m-bromoaniline, diazotization followed by conversion to nitro group can produce m-bromonitrobenzene.

Incorrect Synthesis Route

Nitration of Bromobenzene

Bromine (–Br) is an ortho/para-directing group. Nitration of bromobenzene using HNO₃/H₂SO₄ primarily gives ortho- and para-nitrobromobenzene, not the meta isomer.

This route does NOT produce m-bromonitrobenzene efficiently.

Summary

• Correct: Bromination of nitrobenzene (meta-directing NO₂ group)
• Incorrect: Nitration of bromobenzene (ortho/para-directing Br group)