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Basics of Organic Chemistry question

2023 · 31 Jan · Shift 1 · Q2
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Basics of Organic Chemistry question

2023 · 31 Jan · Shift 1 · Q2

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1

Match items of column I and II

Column I (Mixture of compounds) Column II (Separation Technique)
A. H2O/CH2Cl2\mathrm{H_2O/CH_2Cl_2}H2​O/CH2​Cl2​ i. Crystalization
B. JEE Main 2023 (Online) 31st January Morning Shift Chemistry - Basics of Organic Chemistry Question 112 English ii. Differential solvent extraction
C. Kerosene / Naphthalene iii. Column chromatography
D. C6H12O6/NaCl\mathrm{C_6H_{12}O_6/NaCl}C6​H12​O6​/NaCl iv. Fractional Distillation

Correct match is

  1. A
    A-(ii), B-(iv), C-(i), D-(iii)
  2. B
    A-(iii), B-(iv), C-(ii), D-(i)
  3. C
    A-(i), B-(iii), C-(ii), D-(iv)
  4. D
    A-(ii), B-(iii), C-(iv), D-(i)
View written solutionFree

Correct answer: D

  1. We match each mixture with the most suitable separation technique.
  1. A. H2O/CH2Cl2\mathrm{H_2O/CH_2Cl_2}H2​O/CH2​Cl2​
  • Water and dichloromethane are immiscible liquids.
  • Such mixtures are separated using a separating funnel, i.e. differential solvent extraction.

So, A→(ii)A \to (ii)A→(ii)

  1. C. Kerosene / Naphthalene
  • Kerosene is a liquid mixture, while naphthalene is a solid dissolved in it.
  • On cooling, naphthalene can be obtained because it crystallizes out from the solution.
  • Hence this is separated by crystallization.

So, C→(i)C \to (i)C→(i)

  1. D. C6H12O6/NaCl\mathrm{C_6H_{12}O_6/NaCl}C6​H12​O6​/NaCl
  • Glucose and sodium chloride are both solids, both soluble in water.
  • Their separation is based on different adsorption/partition behavior.
  • Hence column chromatography is suitable.

So, D→(iii)D \to (iii)D→(iii)

  1. The only technique left for B is fractional distillation.

So, B→(iv)B \to (iv)B→(iv)

  1. Therefore the complete matching is: A−(ii),  B−(iv),  C−(i),  D−(iii)A-(ii),\; B-(iv),\; C-(i),\; D-(iii)A−(ii),B−(iv),C−(i),D−(iii)

This corresponds to Option A.

  1. Comparison with stored answer
  • Derived answer: A
  • Stored correct answer: D

These do not match.

The stored answer appears inconsistent because in option D, C→(iv)C \to (iv)C→(iv) would mean kerosene/naphthalene is separated by fractional distillation, which is not appropriate since naphthalene is a solid and crystallization is the better method. Also D→(i)D \to (i)D→(i) is not suitable for glucose/NaCl mixture.

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