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Practical Organic Chemistry question

2025 · 2 Apr · Shift 2 · Q18
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Practical Organic Chemistry question

2025 · 2 Apr · Shift 2 · Q18

JEE MainChemistryPractical Organic ChemistryMCQ+4 / −1

 Match List - I with List - II. \text { Match List - I with List - II. } Match List - I with List - II. 

List - I
(Purification technique)
 List - II
(Mixture of organic compounds)
(A)
 Distillation (simple) \text { Distillation (simple) } Distillation (simple) 

 (I) Diesel + Petrol
(B)
 Fractional distillation \text { Fractional distillation } Fractional distillation 

 (II) Aniline + Water
(C)
 Distillation under reduced pressure \text { Distillation under reduced pressure } Distillation under reduced pressure 

 (III)
Chloroform + Aniline
(D)
 Steam distillation \text { Steam distillation } Steam distillation 
 (IV)
Glycerol + Spent-lye

 Choose the correct answer from the options given below : \text { Choose the correct answer from the options given below : } Choose the correct answer from the options given below : 

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

Correct answer: A

  1. Recall the suitable purification methods

    • Simple distillation: used for separating:

      • a liquid from non-volatile impurities, or
      • two liquids having a large difference in boiling points.

    • Fractional distillation: used for separating miscible liquids with close boiling points.

    • Distillation under reduced pressure: used for high boiling liquids or liquids that decompose near their boiling point.

    • Steam distillation: used for compounds that are steam volatile, immiscible with water, and often heat-sensitive.

  1. Match each mixture

    (A) Distillation (simple)

    Consider Chloroform + Aniline.

    • Boiling point of chloroform ≈61∘C\approx 61^\circ C≈61∘C
    • Boiling point of aniline ≈184∘C\approx 184^\circ C≈184∘C

    The boiling point difference is very large, so they can be separated by simple distillation.

    Hence, (A)→(III)(A) \to (III)(A)→(III)

(B) Fractional distillation

Consider Diesel + Petrol.

These are mixtures of hydrocarbons with different but overlapping boiling ranges, so separation is done by fractional distillation.

Hence, (B)→(I)(B) \to (I)(B)→(I)

(C) Distillation under reduced pressure

Consider Glycerol + Spent-lye.

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

Hence, (C)→(IV)(C) \to (IV)(C)→(IV)

(D) Steam distillation

Consider Aniline + Water.

Aniline is only sparingly soluble in water and is steam volatile, so it can be separated from water by steam distillation.

Hence, (D)→(II)(D) \to (II)(D)→(II)

  1. Final matching
(A)−(III),(B)−(I),(C)−(IV),(D)−(II)(A)-(III), \quad (B)-(I), \quad (C)-(IV), \quad (D)-(II)(A)−(III),(B)−(I),(C)−(IV),(D)−(II)
  1. Compare with options

This corresponds to Option A.

  1. Comparison with stored answer

Stored correct answer = A

Our derived answer = A

So, the answer agrees with the stored correct answer.

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