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JEE Main 2023 · 24 Jan · Shift 2

JEE Main 2023 Chemistry question on Amines and Nitrogen Compounds

Choose the correct colour of the product for the following reaction.



+ 1-Naphthyl amine →\rightarrow
  1. A.
    Blue
  2. B.
    Red
  3. C.
    Yellow
  4. D.
    White
Show answer and solution

Correct option: B

Solution

The reagent shown reacts with 1-naphthylamine in an azo coupling reaction — this is the basis of the Griess test / naphthylamine dye synthesis. The diazonium salt couples with 1-naphthylamine (an activated aromatic amine) at the para position to form an azo compound (–N=N– chromophore) with an extended conjugated system. This extended conjugation causes strong absorption in the visible region, producing a characteristic red (or deep red/magenta) colored azo dye product.

[JEE Main 2023 · 24 Jan · Shift 2]

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