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ChemistryNEET 2025Purification methods: crystallisation, distillation, chromatography

Purification and Characterisation of Organic Compounds

Match List I with List II.

List I (Mixture)List II (Method of separation)
A. I. Distillation under reduced pressure
B. Crude oil in the petroleum industryII. Steam distillation
C. Glycerol from spent-lyeIII. Fractional distillation
D. Aniline–waterIV. Simple distillation

Choose the correct answer from the options given below:

  1. A.A-IV, B-III, C-I, D-II✓
  2. B.A-IV, B-III, C-II, D-I
  3. C.A-III, B-IV, C-I, D-II
  4. D.A-III, B-IV, C-II, D-I

Solution

Chloroform (b.p. 61 °C) and aniline (184 °C) differ widely — simple distillation (IV). Crude oil fractions — fractional distillation (III). Glycerol decomposes at its boiling point — distillation under reduced pressure (I). Aniline from water — steam distillation (II). Hence A-IV, B-III, C-I, D-II.

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