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Compounds Containing Nitrogen question

2016 · 9 Apr · Shift 1 · Q3
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Compounds Containing Nitrogen question

2016 · 9 Apr · Shift 1 · Q3

JEE MainChemistryCompounds Containing NitrogenMCQ+4 / −1
The test to distinguish primary, secondary and tertiary amines is :
  1. A
    Carbylamine reaction
  2. B
    C6H5SO2ClC_6H_5SO_2ClC6​H5​SO2​Cl
  3. C
    Sandmeyer’s reaction
  4. D
    Mustard oil test
View written solutionFree

Correct answer: B

  1. We need the test that can distinguish primary, secondary, and tertiary amines.

  2. Check each option:

    A: Carbylamine reaction

    • This test is given by only primary amines (both aliphatic and aromatic) when heated with chloroform and alcoholic KOH.
    • Secondary and tertiary amines do not respond.
    • So, it distinguishes primary from non-primary, but not all three.

    B: C6H5SO2ClC_6H_5SO_2ClC6​H5​SO2​Cl

    • This is benzenesulphonyl chloride, used in the Hinsberg test.
    • It distinguishes amines as follows:
      • Primary amine: forms sulphonamide having an acidic hydrogen, soluble in alkali.
      • Secondary amine: forms sulphonamide without acidic hydrogen, insoluble in alkali.
      • Tertiary amine: does not form sulphonamide under these conditions; remains insoluble but dissolves in dilute acid as ammonium salt.
    • Hence, this test can distinguish primary, secondary, and tertiary amines.

    C: Sandmeyer’s reaction

    • This is a reaction of diazonium salts, not a general test for distinguishing 1°, 2°, and 3° amines.
    • So, not correct.

    D: Mustard oil test

    • This is also characteristic of primary amines only.
    • It does not distinguish all three classes.

  3. Therefore, the correct test is the Hinsberg test, which uses C6H5SO2ClC_6H_5SO_2ClC6​H5​SO2​Cl.

Option B\boxed{\text{Option B}}Option B​

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