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CBSE 12th Standard Chemistry Subject Alcohols , Phenols and Ethers 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

Out of 0-nitrophenol and p-nitrophenol, which volatile? Explain.

Suggest a reagent for conversion of ethanol to ethanoic acid.

Suggest a reagent for conversion of ethanol to ethanal.

Name the factors responsible for the solubility of alcohols in water.

What is the structure abd IUPAC name of glycerol?

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Answers Key:

Generic 2

5 x 2 = 10

o-Nitrophenol exists as discrete molecules due to intramolecular H-bonding (i.e., chelation) and hence is more volatile than p-nitrophenol which exists as an associated molecule due to intermolecular H-bonding. For structures of chelated and associated molecules.

Any strong oxidising agent such as acidified KMnO₄ or K₂Cr₂O_7.
\(\underset { Ethanol }{ CH_{ 3 }CH_{ 2 }OH\ } \overset { KMn{ O }_{ 4 }/\ { H }_{ 2 }{ SO }_{ 4 } }{ \underset { orK_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }\ /{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow }} \underset { EthanoIC\ acid }{ CH_{ 3 }COHH } \)

Pyridinium chlorochromate in CH₂CI₂
\(\underset { Ethanol }{ CH_{ 3 }CH_{ 2 }OH } \overset { { C }_{ 5 }{ H }_{ 5 }{ NH }^{ + }{ CrO }_{ 3 }{ Cl }^{ - } }{ \underset { CH_{ 2 }{ Cl }_{ 2 } }{ \longrightarrow } } \underset { Ethanol }{ CH_{ 3 }CHO } \)

(i) Hydrogen bonding
(ii) Size of alkyl/aryl group.

HO-CH₂-CHOH-CH₂OH, Propane-1, 2, 3-triol.