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

Identify A and B in the following reaction.

In the following sequence of reactions, write the structures of the compounds P, Q and R.
\(\ P\overset { B{ r }_{ 2 } }{ \underset { Sn/HCI }{ \longrightarrow } } Q\overset { (i)\ { NaNO }_{ 2 }\ /\ HCI,\ 273-278K }{ \underset { (ii)\ { H }_{ 2 }O/{ H }_{ 3 }{ PO }_{ 2 } }{ \longrightarrow } } R\overset { { KMnO }_{ 4 }\ /\ { OH }^{ - } }{ \longrightarrow } o-Bromobenzoic\ acid\)

What is diazotisation? Why are benzenediazonium salts more stable than alkanediazonium salts?

Write the IUPAC name of the following compounds:
\({ H }_{ 3 }C-\underset { \overset { | }{ { H }_{ 3 }C } }{ N } -\overset { \overset { { CH }_{ 3 } }{ | } }{ \underset { \overset { | }{ { C }_{ 2 }{ H }_{ 5 } } }{ C } } -{ CH }_{ 2 }{ CH }_{ 3 }\)

A primary amine, RNH₂ can be reacted with CH₃-X to get secondary amine, R-NHCH₃ but the only disadvantage is that \({ 3 }^{ \circ }\) amine and quaternary ammonium salts are also obtained as side products. Can you suggest a method where RNH₂ forms only \({ 2 }^{ \circ }\) amine

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Answers Key:

Generic 2

5 x 2 = 10

The reaction/process of converting aromatic primary amines into diazonium salts by treatment with a solution of nitrous acid (produced, in situ, by the action of dilute HCI on sodium nitrite) at 273-278 K is called diazotisation. For example,
\({ NaNO }_{ 2 }+HCl\longrightarrow { HNO }_{ 2 }+NaCl\\ { C }_{ 6 }{ H }_{ 5 }-{ NH }_{ 2 }+{ HNO }_{ 2 }+HCl\overset { 273-278K }{ \underset { (Diazotisation) }{ \longrightarrow } } { C }_{ 6 }{ H }_{ 5 }-\overset { + }{ N } \equiv { NCl }^{ - }+2{ H }_{ 2 }O\)

3, N, N, Trimethylpentan-3-amine (Arabic numerals are given preference over alphabets)

Carbylamine reaction is shown by 1° amines only which results in the replacement of two hydrogen atoms attached to nitrogen atom of NH₂ group by one carbon atom. On catalytic reduction the isocyanide forms a secondary amine with one methyl group.
\({ RNH }_{ 2 }\overset { KOH/{ CHCl }_{ 3 } }{ \longrightarrow } RNC\overset { { H }_{ 2 }/Pd }{ \longrightarrow } RNH{ CH }_{ 3 }\\ \quad 1°\quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad 2°\)