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Amines

AIPMT 2014MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2014

Which of the following will be most stable diazonium salt RN2+X-?

  1. CH3N2+X-
  2. C6H5N2+X-
  3. CH3CH2N2+X-
  4. C6H5CH2N2+X-

Answer

(2) C6H5N2+X-

Solution

As per NCERT, primary aliphatic amines form highly unstable alkyldiazonium salts (they decompose at once giving N2), whereas arenediazonium salts are stable at low temperature (273-278 K).

∵ In C6H5N2+ the positive charge is delocalised over the benzene ring by resonance.

CH3N2+, CH3CH2N2+ and C6H5CH2N2+ (the N2+ is on an sp3 carbon) have no such stabilisation.

∴ Benzenediazonium salt is the most stable.

Answer: (2)

Keep practising — Amines

Ques. 2NEET 2013

In the reaction [figure] A is

  1. H3PO2 and H2O
  2. H+/H2O
  3. HgSO4/H2SO4
  4. Cu2Cl2
Ques. 3NEET 2013 (Karnataka)

On hydrolysis of a "compound", two compounds are obtained. One of which on treatment with sodium nitrite and hydrochloric acid gives a product which does not respond to iodoform test. The second one reduces Tollens reagent and Fehling's solution. The "compound" is

  1. CH3CH2CH2NC
  2. CH3CH2CH2CN
  3. CH3CH2CH2ON=O
  4. CH3CH2CH2CON(CH3)2
Ques. 4NEET 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
Ques. 5AIPMT 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. 6AIPMT 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. 7AIPMT 2011 (Mains)

Which of the following compounds is most basic?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8AIPMT 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. 9AIPMT 2011 (Prelims)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10AIPMT 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. 11AIPMT 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

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