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Amines

NEET 2013 (Karnataka)MCQMedium📈 Topic in 62% papers+4−1
Ques. 1NEET 2013 (Karnataka)

Some reactions of amines are given. Which one is not correct?

  1. [figure]
  2. CH3CH2NH2 + HNO2 CH3CH2OH + N2
  3. CH3NH2 + C6H5SO2Cl CH3NHSO2C6H5
  4. (CH3)2NH + NaNO2 + HCl (CH3)2N-N=O

Answer

(1) [figure]

Solution

(1) Only primary aromatic amines form arenediazonium salts with NaNO2 + HCl. N,N-Dimethylaniline is a tertiary amine, so no diazonium salt is formed; it undergoes electrophilic substitution at the para position giving p-nitroso-N,N-dimethylaniline:

(CH3)2N-C6H5 + HNO2 (CH3)2N-C6H4-NO (para) + H2O

⇒ reaction (1) is not correct.

(2) Primary aliphatic amines with nitrous acid give alcohols with evolution of N2 ⇒ correct.

(3) A primary amine with benzenesulphonyl chloride (Hinsberg's reagent) gives N-alkylbenzenesulphonamide ⇒ correct.

(4) A secondary amine with nitrous acid gives an N-nitrosoamine ⇒ correct.

Answer: (1)

Keep practising — Amines

Ques. 2AIPMT 2012 (Mains)

An organic compound (C3H9N) (A), when treated with nitrous acid, gave an alcohol and N2 gas was evolved. (A) on warming with CHCl3 and caustic potash gave (C) which on reduction gave isopropylmethylamine. Predict the structure of (A)

  1. [figure]
  2. CH3CH2-NH-CH3
  3. [figure]
  4. CH3CH2CH2-NH2
Ques. 3AIPMT 2011 (Mains)

An organic compound A on treatment with NH3 gives B, which on heating gives C. C when treated with Br2 in the presence of KOH produces ethyl amine. Compound A is

  1. CH3COOH
  2. CH3CH2CH2COOH
  3. [figure]
  4. CH3CH2COOH
Ques. 4AIPMT 2011 (Mains)

Which of the following compounds is most basic?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5AIPMT 2011 (Prelims)

In a set of reactions m-bromobenzoic acid gave a product D. Identify the product D. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6AIPMT 2011 (Prelims)

What is the product obtained in the following reaction? [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7AIPMT 2010 (Mains)

Match the compounds given in List-I with their characteristic reactions given in List-II. Select the correct option.

  1. A-(ii), B-(i), C-(iv), D-(iii)
  2. A-(iii), B-(ii), C-(i), D-(iv)
  3. A-(ii), B-(iii), C-(i), D-(iv)
  4. A-(iv), B-(ii), C-(iii), D-(i)
Ques. 8AIPMT 2010 (Prelims)

Acetamide is treated with the following reagents separately. Which one of these would yield methyl amine?

  1. NaOH/Br2
  2. Sodalime
  3. Hot conc. H2SO4
  4. PCl5
Ques. 9AIPMT 2010 (Prelims)

Which of the following statements about primary amines is false?

  1. Alkyl amines are stronger bases than aryl amines.
  2. Alkyl amines react with nitrous acid to produce alcohols.
  3. Aryl amines react with nitrous acid to produce phenols.
  4. Alkyl amines are stronger bases than ammonia.
Ques. 10AIPMT 2010 (Prelims)

Aniline in a set of the following reactions yielded a coloured product Y. [figure] The structure of 'Y' would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11AIPMT 2009

Predict the product. [figure]

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

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