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JEE Main 2026 Jan 28 Shift 1, Chemistry Q5: Purification Methods

JEE Main2026Jan 28, Shift 1Chemistry
Q.

Method used for separation of mixture of products (B and C) obtained in the following reaction is:

  1. A

    Simple distillation

  2. B

    sublimation

  3. C

    steam distillation

  4. D

    fractional distillation

Solution

Br/FeBr gives bromobenzene (A). Nitration of A under conc. HNO/conc. HSO produces a mixture of ortho- and para-bromonitrobenzene (B and C).

The two isomers are both liquids/low-melting solids with close but distinct boiling points and similar volatility. Their separation relies on the small difference in boiling point, which is exactly what fractional distillation exploits.

Option (4), fractional distillation, is correct.

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