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CBSE 12th Standard Chemistry Subject Amines Ncert Exemplar 2 Mark Questions 2021

Published on: 25/05/2021

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Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

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Questions:

Generic 2

5 x 2 = 10

What is Hinsberg reagent?

What is the best reagent to convert nitrile to primary amine?

What is the product when C₆H₅CH₂NH₂ reacts with NHO₂?

Why is NH₂ group of aniline acetylated before carrying out nitration?

What is the rol of HNO₃ in the nitrating mixture used for nitration of benzene?

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Answers Key:

Generic 2

5 x 2 = 10

Benzenesulphonyl chloride (C₆H₅SO₂CI) is called Hinsberg's reagent.

Reduction of nitriles with Na / C₂H₅OH or LiAlH₄ gives primary amines

When benzylamine is treated with HNO₂, benzyldiazonium chloride is first formed whivh being unstable decomposes to form benzyl alcohol.

It is because it will get oxidised with nitric acid if it is not acetylated.

HNO acts as a base in the nitrating mixture (conc.HNO₃+conc.H₂SO₄). H₂SO₄ acts on HNO₃ to generate the electrophile, \({ NO }_{ 2 }^{ + }\) (nitronium ion)