Question

Give sample Papers of Chemistry class 12th 2021 CBSE in attachment

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Answer 1

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General Instructions:

Read the following instructions carefully.

a) There are 33 questions in this question paper. All questions are compulsory.

b) Section A: Q. No. 1 to 16 are objective type questions. Q. No. 1 and 2 are passage based questions carrying 4 marks each while Q. No. 3 to 16 carry 1 mark each.

c) Section B: Q. No. 17 to 25 are short answer questions and carry 2 marks each.

d) Section C: Q. No. 26 to 30 are short answer questions and carry 3 marks each.

e) Section D: Q. No. 31 to 33 are long answer questions carrying 5 marks each.

f) There is no overall choice. However, internal choices have been provided.

g) Use of calculators and log tables is not permitted.

SECTION A (OBJECTIVE TYPE)

1. Read the passage given below and answer the following questions: (1x4=4)

An efficient, aerobic catalytic system for the transformation of alcohols into carbonyl compounds

under mild conditions, copper-based catalyst has been discovered. This copper-based catalytic

The following questions are multiple choice questions. Choose the most appropriate answer:

(i)The Copper based catalyst mention in the study above can be used to convert:

a) propanol to propanonic acid

b) propanone to propanoic acid

c) propanone to propan-2-ol

d) propan-2-ol to propanone

(ii) The carbonyl compound formed when ethanol gets oxidised using this copper-based catalyst can also be obtained by ozonolysis of:

a) But-1-ene

b) But-2-ene

c) Ethene

d) Pent-1-ene

OR

Which of the following is a secondary allylic alcohol?

a) But-3-en-2-ol

b) But-2-en-2-ol

c) Prop-2-enol

d) Butan-2-ol

(iii) Benzyl alcohol on treatment with this copper-based catalyst gives a compound ‘A’ which on reaction with KOH gives compounds ‘B’ and ‘C’. Compound ‘B’ on oxidation with

KMnO4- KOH gives compound ‘C’. Compounds ‘A’, ‘B’ and ‘C’ respectively are :

a) Benzaldehyde, Benzyl alcohol, potassium salt of Benzoic acid

b) Benzaldehyde, potassium salt of Benzoic acid, Benzyl alcohol

c) Benzaldehyde, Benzoic acid, Benzyl alcohol

d) Benzoic acid, Benzyl alcohol, Benzaldehyde

(iv) An organic compound ‘X’ with molecular formula C3H8O on reaction with this

copper based catalyst gives compound ‘Y’ which reduces Tollen’s reagent. ‘X’ on

reaction with sodium metal gives ‘Z’ . What is the product of reaction of ‘Z’ with 2-

chloro-2-methylpropane?

a) CH3CH2CH2OC(CH3)3

b) CH3CH2OC(CH3)3

c) CH2=C(CH3)2

d) CH3CH2CH=C(CH3)2

.

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