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12th Standard Chemistry English Medium - Carbonyl Compounds 3 Mark Book Back Question Paper and Answer Key 2022 - 2023

Published on: 02/09/2022

QB365 provides a detailed and simple solution for every Possible Book Back Questions in Class 12 Chemistry Subject - Carbonyl Compounds, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.

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Questions:

Generic 3

9 x 3 = 27

How are the following conversions effected
phenylmethanal into benzoin

How are the following conversions effected
phenylmethanal into benzoic acid

How are the following conversions effected
(b) Hex-3-yne into hexan-3-one.

Oxidation of ketones involves carbon – carbon bond cleavage. Name the product (s) is / are formed on oxidising 2,5 – dimethyhexan – 3- one using strong oxidising agent.

Identify A, B and C

Complete the following reaction
\({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 }\overset { HO-{ CH }_{ 2 }-{ CH }_{ 2 }-OH }{ \underset { { dry }{ HCl} }{ \longrightarrow } } ?\)

How are the following conversions effected
(a) propanal into butanone
(b) Hex-3-yne into hexan-3-one.
(c) phenylmethanal into benzoic acid
(d) phenylmethanal into benzoin

Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.

Identify A, B and C

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Answers Key:

Generic 3

9 x 3 = 27

Phenylmethanal into benzoin

Phenylmethanal into benzoic acid:

Hex-3-yne into hexan-3-one:
Hydration of alkynes in 42% sulphuric acid containg H₂SO₄ as catalyst
\(\underset {Hex-3-yne}{\mathrm{CH}_{3}-\mathrm{CH}_{2}}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \frac{\mathrm{HgSO}_{4}}{\mathrm{H}_{2} \mathrm{SO}_{4} / \mathrm{H}_{2} \mathrm{O}} \)

(i) This oxidation is governed by Popoff's rule.
(ii) It states that during the oxidation of an unsymmetrical ketone, a (C-CO) bond is cleaved in such a way that the keto group stays with the smaller alkyl group.

Phenyl Acetic acid
Benzyl Magnesium bromide

2- Pentanone.

Propanal into butanone:

(b) Hex-3-yne into hexan-3-one.
Hydration of alkynes in 42% sulphuric acid containg H₂SO₄ as catalyst
\(\underset {Hex-3-yne}{\mathrm{CH}_{3}-\mathrm{CH}_{2}}-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \frac{\mathrm{HgSO}_{4}}{\mathrm{H}_{2} \mathrm{SO}_{4} / \mathrm{H}_{2} \mathrm{O}} \)

(c) phenylmethanal into benzoic acid

(d) phenylmethanal into benzoin