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Practical Organic Chemistry question

2025 · 4 Apr · Shift 2 · Q3
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Practical Organic Chemistry question

2025 · 4 Apr · Shift 2 · Q3

JEE MainChemistryPractical Organic ChemistryMCQ+4 / −1

Match List - I with List - II

List - I
(Separation of)		 List - II
(Separation Technique)
(A) Aniline from aniline-water mixture (I) Simple distillation
(B) Glycerol from spent-lye in soap industry (II) Fractional distillation
(C) Different fractions of crude oil in petroleum industry (III) Distillation at reduced pressure
(D) Chloroform-Aniline mixture (IV) Steam distillation

Choose the correct answer from the options given below :

  1. A
    (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
  2. B
    (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
  3. C
    (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
  4. D
    (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
View written solutionFree

Correct answer: A

  1. We match each separation with the most suitable distillation technique.
  1. (A) Aniline from aniline-water mixture

Aniline is an organic liquid which is immiscible with water and is steam volatile. So, aniline is separated from water by steam distillation.

Thus,

(A)→(IV)(A) \to (IV)(A)→(IV)
  1. (B) Glycerol from spent-lye in soap industry

Glycerol has a very high boiling point and may decompose on strong heating at atmospheric pressure. Therefore, it is purified by distillation at reduced pressure (vacuum distillation).

Thus,

(B)→(III)(B) \to (III)(B)→(III)
  1. (C) Different fractions of crude oil in petroleum industry

Crude oil contains many liquids with different but fairly close boiling points. Such mixtures are separated by fractional distillation.

Thus,

(C)→(II)(C) \to (II)(C)→(II)
  1. (D) Chloroform-Aniline mixture

Chloroform and aniline are miscible liquids with sufficiently different boiling points:

  • Chloroform: about 61∘C61^\circ \mathrm{C}61∘C
  • Aniline: about 184∘C184^\circ \mathrm{C}184∘C

Since the boiling point difference is large, simple distillation is suitable.

Thus,

(D)→(I)(D) \to (I)(D)→(I)
  1. Final matching:
(A)−(IV),(B)−(III),(C)−(II),(D)−(I)(A)-(IV),\quad (B)-(III),\quad (C)-(II),\quad (D)-(I)(A)−(IV),(B)−(III),(C)−(II),(D)−(I)

This corresponds to Option A.

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