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CBSE 12th Standard Chemistry Subject Haloalkanes and Haloarenes Ncert Exemplar Fill Ups 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

4 x 2 = 8

Identify the products A and B formed in the following reaction:CH₃-CH₂-CH = CH-CH₃+HCl \(\longrightarrow\) A+B

Out of o-and p-dibromobenzene which one has higher melting point and why?

Iodoform has antiseptic properties. Give one reason to support it.

Racemic mixture is optically inactive. Give reason.

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Answers Key:

Generic 2

4 x 2 = 8

\({ CH }_{ 3 }-{ CH }_{ 2 }=CH=CH-{ CH }_{ 3 }+HCI\longrightarrow { CH }_{ 3 }-{ CH }_{ 2 }-\underset { \overset { | }{ Cl } }{ CH } -{ CH }_{ 2 }-{ CH }_{ 3 }+{ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { | }{ Cl } }{ CH } -{ CH }_{ 3 }\\ \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad 'A'\quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad 'B'\quad \quad \quad \quad \quad \quad \)

p-dibromobenzene has higher melting point because it is symmetrical and fits into crystal lattice more readily.

The antiseptic propertics of iodoform is due to I₂ which is liberated when iodoform comes in constact with skin.

A 50 : 50 mixture of two enantiomers of any optically active compound is called a racemic mixture. It is always optically inactive since rotation caused by the molecules of one enantiomer. For example, an equimolar mixture of (+)-2 bromobutane and (-) -2- bromobutane is called a racemic mixture.