Question

The product (P) formed from the following multistep reaction is:

• A.

  

• B.

  

• C.

  

• D.

  

Hint:

Multistep organic reactions often involve strategic functional group transformations. Understanding the role of each reagent is crucial for predicting the final product

Answer 1

The Correct Option is A

Multistep Reaction Mechanism : 

1. Step 1 : Bromination (Br₂) : The nitrobenzene derivative undergoes bromination, where the bromine atom attaches to the para position relative to the nitro group due to its electron-withdrawing nature.
2. Step 2: Reduction (H₂/Pd): The nitro group is reduced to an amine group (-NH₂), forming a bromoaniline derivative.
3. Step 3: Diazotization (NaNO₂, HCl, 0°C): The amine group reacts with nitrous acid (generated in situ from NaNO₂ and HCl), forming a diazonium salt (-N⁺²Cl^-).
4. Step 4: Reduction (H₃PO₂): The diazonium group is replaced by hydrogen, yielding the final product where the nitro group is completely removed, and the bromine atom remains attached at the para position relative to the methyl group.

Final Product: 4-bromo-1-methylbenzene (P).