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Amines

NEET 2016 (Phase 2)MCQMedium📈 Topic in 62% papers+4−1
Ques. 1NEET 2016 (Phase 2)

Which one of the following nitro-compounds does not react with nitrous acid?

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

Answer

(3) [figure]

Solution

Nitrous acid reacts with a nitroalkane only through the α-hydrogen (H on the carbon bearing -NO2):

1° nitroalkane (RCH2NO2, two α-H) nitrolic acid, RC(NO2)=NOH

2° nitroalkane (R2CHNO2, one α-H) pseudonitrole, R2C(NO)NO2

3° nitroalkane (R3CNO2, no α-H) no reaction

(1) CH3CH2CH2NO2 – 1°, two α-H, reacts.

(2) (CH3)2CHCH2NO2 – 1°, two α-H, reacts.

(3) (CH3)3C-NO2 – 3°, no α-H, does not react.

(4) CH3COCH(CH3)NO2 – 2°, one α-H, reacts.

2-Methyl-2-nitropropane does not react with nitrous acid.

Answer: (3)

Keep practising — Amines

Ques. 2NEET 2016 (Phase 2)

A given nitrogen-containing aromatic compound 'A' reacts with Sn/HCl, followed by HNO2 to give an unstable compound 'B'. 'B', on treatment with phenol, forms a beautiful coloured compound 'C' with the molecular formula C12H10N2O. The structure of compound 'A' is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3AIPMT 2015

The following reaction [figure] is known by the name

  1. Perkin's reaction
  2. Acetylation reaction
  3. Schotten-Baumann reaction
  4. Friedel-Craft's reaction
Ques. 4AIPMT 2015

Method by which aniline cannot be prepared is

  1. degradation of benzamide with bromine in alkaline solution
  2. reduction of nitrobenzene with H2/Pd in ethanol
  3. potassium salt of phthalimide treated with chlorobenzene followed by hydrolysis with aqueous NaOH solution
  4. hydrolysis of phenylisocyanide with acidic solution.
Ques. 5AIPMT 2015 (Cancelled)

The electrolytic reduction of nitrobenzene in strongly acidic medium produces

  1. azobenzene
  2. aniline
  3. p-aminophenol
  4. azoxybenzene.
Ques. 6AIPMT 2014

In the following reaction, the product (A) is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7AIPMT 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-
Ques. 8NEET 2013

In the reaction [figure] A is

  1. H3PO2 and H2O
  2. H+/H2O
  3. HgSO4/H2SO4
  4. Cu2Cl2
Ques. 9NEET 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. 10NEET 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. 11AIPMT 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

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