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Amines

JEE Main 2024 (Online) 30th January Morning ShiftMCQEasy📈 Topic in 24% papers+4−1
Ques. 1JEE Main 2024, 30 January (Morning Shift)

Following is a confirmatory test for aromatic primary amines. Identify reagent (A) and (B). [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(1) [figure]

Solution

Diazotisation ⇒ A = NaNO2 + HCl, 0 – 5°C:

C6H5NH2 + NaNO2 + 2HCl

0-5 C C6H5 N2 Cl + NaCl + 2H2O

Coupling with 2-naphthol (β-naphthol) in NaOH at C-1:

[figure]

∵ an orange-red (scarlet) azo dye with β-naphthol confirms an aromatic 1° amine ⇒ B = 2-naphthol

(B), (C): aniline / 1-naphthol is not the reagent of this test ⇒ (B), (C) are wrong

(D): HNO3/H2SO4 does not give a diazonium salt ⇒ (D) is wrong

Answer: (1)

Keep practising — Amines

Ques. 2JEE Main 2024, 30 January (Evening Shift)

The products A and B formed in the following reaction scheme are respectively [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2024, 29 January (Morning Shift)

The arenium ion which is not involved in the bromination of Aniline is .

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4JEE Main 2024, 29 January (Evening Shift)

The product A formed in the following reaction is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5JEE Main 2024, 27 January (Evening Shift)

Identify B formed in the reaction. Cl-(CH2)4-Cl excess NH3 A NaOH B + H2O + NaCl

  1. [figure]
  2. [figure]
  3. -Cl +NH3-(CH2)4- +NH3Cl-
  4. H2N-(CH2)4-NH2
Ques. 6JEE Main 2024, 27 January (Evening Shift)

9.3 g of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the reaction is 100% completed is 10-1 g. (Given molar mass in g mol-1 N : 14, O : 16, C : 12, H : 1)

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