CBSE Class 12 Chemistry Previous Year Question Paper 2021-22

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This document contains the CBSE Class 12 Chemistry Previous Year Question Paper for the 2021-22 session, focusing on the topic of Alcohols, Phenols and Ethers. It includes various question formats such as Multiple Choice Questions (MCQs) and Very Short Answer (VSA) questions, with some questions carrying 1 mark. The paper covers nomenclature, structures of functional groups, and reactions of alcohols and phenols, including oxidation, acidic strength, and electrophilic substitution. It also features conversion questions and reactions like Kolbe's reaction. Solving this board question paper is crucial for students to understand the exam pattern, identify important topics, and enhance their preparation for the final CBSE board examinations.

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BoardCBSE
Class12
SubjectChemistry
Session2021-22
LanguageEnglish
TypePrevious Year Question Paper
Exam typeBoard Exam

Paper pattern

The paper includes Multiple Choice Questions (MCQs) and Very Short Answer (VSA) questions, with some questions marked for 1 mark.

Topics covered

Paper topics

  • Nomenclature of Alcohols
  • Nomenclature of Phenols
  • Nomenclature of Ethers
  • Bond angles in Alcohols
  • Oxidation of Alcohols
  • Acidity of Phenols
  • Electrophilic Substitution in Phenols
  • Reactions of Alcohols
  • Reactions of Phenols
  • Conversion Reactions
  • Kolbe's Reaction
  • Cumene Process
  • Aspirin Synthesis

Important topics

  • IUPAC Naming
  • Oxidation Reactions
  • Acidic Nature of Phenols
  • Electrophilic Aromatic Substitution
  • Functional Group Transformations

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Question paper text

Alcohols, Phenols and Ethers

Previous Years' CBSE Board Questions

7.2 Nomenclature

MCQ

The C — O — H bond angle in alcohol is

(a) slightly greater than 109°28'

<math>CH_3</math>

  1. The correct IUPAC name of CH<sub>3</sub>-C-CH<sub>2</sub>CH<sub>3</sub> is
  2. tert-butyl alcohol OH
  3. 2,2-Dimethylpropanol
  4. 2-Methylbutan-2-ol
  5. 3-Methylbutan-3-ol

(d) slightly less than 120° (Term I, 2021-22) [II

VSA (1 mark)

Write the IUPAC name of the following:

<math>CH_3</math> CH<sub>3</sub>-C-CH-CH<sub>3</sub> H<sub>5</sub>C<sub>2</sub> OH

(2018) (Ap

  1. Write the IUPAC name of the following compound:

<math>H_3C-C=C-CH_2-OH</math> H<sub>3</sub>C Br

(AI 2017)

  1. Write the IUPAC name of the following compound:

<math>CH = CH - CH_2OH</math>

(AI 2017) (Ap)

  1. Write the IUPAC name of the following compound:

<math>CH_3</math>

CH3-O-C-CH3

(AI 2017)

  1. Write the IUPAC name of the given compound.

<math>CH_2 - CH_2 - OH</math>

(AI 2016)

(2023)

  1. Write the IUPAC name of the given compound:

O<sub>2</sub>N

(Delhi 2015) (Ap)

  1. Write the IUPAC name of the given compound: <math>CH_2 = C - CH_2 - OH</math> CH<sub>3</sub> (AI 2015)
  2. Write the IUPAC name of the given compound: HO-CH<sub>2</sub>-CH=C-CH<sub>3</sub> CH<sub>2</sub> (Foreign 2015)

Name the following according to IUPAC system : CH<sub>3</sub>-CH-CH<sub>2</sub>-CH<sub>3</sub> OH (1/2, Delhi 2015C)

  1. Write IUPAC name of the following compound : HO-CH2-CH-CH2-OH OH (Foreign 2014)

7.3 Structures of Functional Groups

MCQ

  1. slightly less than 109°28'
  2. slightly greater than 120°

Assertion (A): The C — O — H bond angle in alcohols

is slightly less than the tetrahedral angle.

Reason (R): This is due to the repulsive interaction

between the two lone electron pairs on oxygen.

  1. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
  2. Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
  3. Assertion (A) is correct, but Reason (R) is incorrect statement.
  4. Assertion (A) is incorrect, but Reason (R) is correct statement. (2020) Ap

7.4 Alcohols and Phenols

MCQ

14. Which of the following alcohols will not undergo

oxidation?

  1. Butanol (b) Butan-2-ol (c) 2-Methylbutan-2-ol (d) 3-Methylbutan-2-ol

15. In the reaction <math>R - OH + HCI \xrightarrow{ZnCI_2} RCI + H_2O</math>,

what is the correct order of reactivity of alcohol?

  1. 1° < 2° < 3° (b) 1° > 3° > 2°
  2. 1° > 2° > 3° (d) 3° > 1° > 2°

(2023)

Read the passage given below and answer the following

questions (Q. No. 16 to 18):

Alcohols and phenols are acidic in nature. Electron

withdrawing groups in phenol increase its acidic strength

and electron donating groups decrease it. Alcohols undergo

nucleophilic substitution with hydrogen halides to give

alkyl halides. On oxidation primary alcohols yield aldehydes

with mild oxidising agents and carboxylic acids with strong

oxidising agents while secondary alcohols yield ketones.

The presence of - OH groups in phenols activates the

ring towards electrophilic substitution. Various important

products are obtained from phenol like salicylaldehyde,

salicylic acid, picric acid etc.

  1. Which of the following alcohols is resistant to oxidation? <math>CH_3</math>
  2. CH<sub>3</sub>-C-OH (b) CH<sub>3</sub>-CH-OH CH<sub>2</sub>
  3. CH<sub>3</sub>-CH<sub>2</sub>-OH (d) CH<sub>3</sub>-OH

Which of the following groups increases the acidic character of phenol?

  1. CH<sub>3</sub>O - (b) CH<sub>3</sub> -
  2. NO<sub>2</sub> - (d) All of these
  1. Consider the following reaction:

OH

  1. NaOH, CO<sub>2</sub> (i) CHCl<sub>3</sub>+aq. NaOH X ←

the products X and Y are

OH CHO COOH

  1. <math>X =</math> <math>Y =</math> ОΗ OH CHO COOH
  2. <math>X =</math> Y =

COOH OH

  1. X = Y = OH CHO OH OH COOH CHO
  2. X = Y =

(Term I, 2021-22)

In the following reaction, <math>CH_3-CH=CH-CH_2-OH \xrightarrow{PCC}</math> the product formed is

  1. CH<sub>3</sub> — CHO and CH<sub>3</sub>CH<sub>2</sub>OH
  2. CH<sub>3</sub>—CH=CH—COOH
  3. CH<sub>3</sub>-CH=CH-CHO
  4. CH<sub>3</sub>-CH<sub>2</sub>-CH<sub>2</sub>-CHO

(Term I, 2021-22) U

  1. Which of the following acids reacts with acetic anhydride to form aspirin?
  2. Benzoic acid (b) Salicylic acid
  3. Phthalic acid (d) Acetic acid (Term I, 2021-22)
  1. Assertion (A): o-nitrophenol is a weaker acid than
  2. nitrophenol. Reason (R): Intramolecular hydrogen bonding makes ortho isomer weaker than para isomer.
  3. Both assertion (A) and reason (R) are correct statements, and reason (R) is the correct explanation of the assertion (A).
  1. Both assertion (A) and reason (R) are correct statements, but reason (R) is not the correct explanation of the assertion (A).
  2. Assertion (A) is correct, but reason (R) is incorrect statement.
  3. Assertion (A) is incorrect, but reason (R) is correct statement. (2020)

The conversion of an alkyl halide into an alcohol by

aqueous NaOH is classified as

(a) a dehydrohalogenation reaction (d)

  1. (c) an addition reaction
  1. Assertion (A): Alcohols have higher boiling point than alkanes of comparable molecular mass. Reason (R): Alcohols have intramolecular hydrogen bond.
  2. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of Assertion (A).
  3. Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of Assertion (A).
  4. Assertion (A) is correct, but Reason (R) is incorrect statement.
  5. Assertion (A) is incorrect, but Reason (R) is correct statement. (2020C)

VSA (1 mark)

Carry out the following conversion:

Phenol to salicylaldehyde (1/5, 2020)

Carry out the following conversion:

Propene to propanol (1/5, 2020) Cr

Predict the reagent for carrying out the following

conversion: Phenol to benzoquinone (1/5, 2020, 2019)

Predict the reagent for carrying out the following

conversion: Phenol to 2,4,6-tribromophenol (1/5, 2020)

Write the preparation of phenol from cumene.

(1/3, 2020)

  1. How can you convert the following? Phenol to chlorobenzene. (1/3, 2020) Cr
  2. How can you convert the following? Sodium phenoxide to o-hydroxybenzoic acid. (1/3, 2020)

OR

Write the equation involved in the following

reaction: Kolbe's reaction (1/2, Al 2019, Delhi 2014C)

31. How can you convert the following?

Ethanol to propanenitrile. (1/3, 2020)

Frequently asked questions

What is this document?

This is a previous year's CBSE Board Question Paper for Class 12 Chemistry, specifically covering the topic of Alcohols, Phenols and Ethers from the 2021-22 session.

What is the main focus of this paper?

The paper focuses on testing students' understanding of the nomenclature, structures, and reactions related to Alcohols, Phenols, and Ethers.

How can solving this paper help students?

Solving this previous year question paper helps students understand the exam pattern, identify important concepts, and practice answering questions for the CBSE Class 12 Chemistry board exam.

What types of questions are included?

The paper includes Multiple Choice Questions (MCQs) and Very Short Answer (VSA) questions, including conversion problems and reaction identification.

Is this paper useful for exam preparation?

Yes, this board question paper is an essential resource for Class 12 Chemistry students to prepare effectively for their final examinations by practicing with authentic questions.

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