CBSE Class 12 Chemistry Haloalkanes and Haloarenes Previous Year Question Paper 2021-22

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This document presents the CBSE Class 12 Chemistry Previous Year Question Paper for the 2021-22 session, focusing on the chapter Haloalkanes and Haloarenes. It includes a variety of question types such as Multiple Choice Questions (MCQ), Very Short Answer (VSA) questions worth 1 mark, and Short Answer (SA) questions worth 2 or 3 marks. The paper covers topics like classification of halides, nomenclature, methods of preparation, physical properties, and chemical reactions including nucleophilic substitution. Questions are drawn from various CBSE board exams, indicated by years and sets (e.g., Term I, 2021-22, AI 2017, Delhi 2013). Solving this previous year question paper is crucial for students to understand the exam pattern, identify important topics, and enhance their preparation for the board examinations.

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

Paper pattern

The paper includes MCQs, VSA (1 mark), and SA (2-3 marks) questions, covering various aspects of Haloalkanes and Haloarenes.

Topics covered

Paper topics

  • Classification of Haloalkanes
  • Nomenclature of Haloalkanes
  • Methods of Preparation of Haloalkanes
  • Physical Properties of Haloalkanes
  • Chemical Reactions of Haloalkanes
  • Nucleophilic Substitution Reactions
  • Haloarenes
  • Wurtz-Fitting reaction
  • Swarts reaction
  • Sandmeyer reaction
  • Finkelstein reaction
  • SN1 reaction
  • SN2 reaction

Important topics

  • Classification of halides
  • IUPAC nomenclature
  • Preparation methods (Swarts, Finkelstein)
  • Boiling point trends
  • Reactivity towards SN2
  • Chirality
  • Mechanism of SN1/SN2 reactions

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Question paper text

Haloalkanes and Haloarenes

Previous Years' CBSE Board Questions

6.1 Classification

MCQ

1 Which one of the following halides contains <math>C_{so^2} - X</math> bond?

  1. Allyl halide (b) Alkyl halide
  2. Benzyl halide (d) Vinyl halide (Term I, 2021-22) (Ap)

(2023)

VSA (1 mark)

2 Out of and which is an example of allylic halide? (Al 2017)

  1. Out of il and which is an example of vinylic halide? (AI 2017)
  2. (Term I, 2021-22) An

CHCl<sub>2</sub> CH<sub>2</sub>CH<sub>2</sub>CI 4 Out of and , which is an example of a benzylic halide? (AI 2017) U

6.2 Nomenclature

VSA (1 mark)

CH<sub>3</sub>

  1. Write the IUPAC name of <math>CH_3CH = CH - C - CH_3</math> Br (Al 2019, Delhi 2013)
  1. Write the structure of 1-bromo-4-chlorobut-2-ene.

(Delhi 2017) CH<sub>2</sub> — CH<sub>3</sub> Br<sub>2</sub>, UV light

O2N (1/3, Al 2016)

  1. Write the structure of 3-bromo-2-methylprop- 1-ene. (Delhi 2017) [II]
  2. Draw the structure of 2-bromopentane. (Delhi 2014C)

SA (2 marks)

  1. Write the IUPAC names of the following compounds:
  2. CH<sub>2</sub>=CHCH<sub>2</sub>Br
  3. (CCI<sub>3</sub>)<sub>3</sub>CCI (AI 2014C)

6.4 Methods of Preparation of Haloalkanes

MCQ

The synthesis of alkyl flouride is best obtained from (c)

  1. Free radicals (b) Swarts reaction

Which of the following isomer of pentane (C<sub>5</sub>H<sub>12</sub>) will

give three isomeric monochlorides on photochemical

chlorination?

CH<sub>3</sub>-

(b) CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub>

CH<sub>3</sub>-CH-CH<sub>2</sub>-CH<sub>3</sub> (d) All of the above.

CH<sub>3</sub>

VSA (1 mark)

  1. How can you convert the following? But-1-ene to 1-iodobutane (NCERT, 1/3, 2020) (An
  2. Give reason for the following: Thionyl chloride method is preferred for preparing alkyl chloride from alcohols. (1/3, Al 2019) U
  3. How do you convert: Propene to 1-iodopropane? (1/3, Al 2016)
  4. Write equation for preparation of 1-iodobutane from 1-chlorobutane. (1/3, Al 2019)
  5. Write the major product in the following:
  6. Write the structure of the major product in the following reaction: <math>CH_3 - CH = C - CH_3 + HBr \longrightarrow</math> <math>CH_3</math> (1/3, Al 2015)

(2 marks)

Draw the structure of major monohalo product in

each of the following reactions:

SA II (3 marks) Give the IUPAC names of the following compounds:

  1. CH<sub>3</sub> - CH - CH<sub>2</sub> - CH<sub>3</sub> (i) (NCERT)

Вr Br

(ii)

  1. Br
  2. Write the mechanism of the following reaction: CH3CH2OH -HBr > CH3CH2Br + H2O (AI 2014)
  3. CH<sub>2</sub>=CH-CH<sub>2</sub>-CI (AI 2015C)

6.5 Preparation of Haloarenes

MCQ

(Term I, 2021-22)

The species that attacks benzene in following is

AICI<sub>3</sub> +Cl2

  1. CI<sup>-</sup> (b) AICI<sub>2</sub> (c) AICI3 (d) CI+

(2023)

6.6 Physical Properties

MCQ

  1. Which of the following has highest boiling point?
  2. C<sub>2</sub>H<sub>5</sub>−F (b) C<sub>2</sub>H<sub>5</sub> − CI
  3. C<sub>2</sub>H<sub>5</sub> - Br (d) C<sub>2</sub>H<sub>5</sub>−1 (Term I, 2021-22)

Assertion (A): Boiling points of alkyl halides decrease in the order R-I > R-Br > R-CI > R-F. Reason (R): van der Waals' forces decrease with increase in the size of halogen atom.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true and R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.

VSA (1 mark)

  1. Give reason for the following :
  2. dichlorobenzene has higher melting point than that of ortho or meta isomer. (1/3, Al 2019)

<math>CH_3</math>

2Na+CH3CI + 2NaCl

Explain the following: Alkyl halides, though polar, are immiscible with water. (NCERT, 1/2, Al 2017C, 1/3, Foreign 2015)

(b) Wurtz-Fitting reaction

(d) None of the above

(2021 C)

Explain why the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride. (NCERT, 1/3, Delhi 2016)

  1. Give reason: n-Butyl bromide has higher boiling point than t-butyl bromide. (1/3, Delhi 2015) U

6.7 Chemical Reactions Nucleophilic Substitution Reactions

MCQ

  1. Which of the following molecules has a chiral centre correctly labelled with an asterisk(*)?
  2. CH<sub>3</sub>C'HBrCH<sub>3</sub>
  3. CH<sub>3</sub>C'HCICH<sub>2</sub>Br
  4. HOCH2C'H(OH)CH2OH
  5. CH<sub>3</sub>C'Br<sub>2</sub>CH<sub>3</sub>
  1. Consider the following compounds

the correct order of reactivity towards S<sub>N</sub>2 reaction

  1. 1>111>11 (b) || > || > |
  2. || > | > || (d) ||| > | > ||
  1. In the reaction, <math>-Br \xrightarrow{Mg} 'X' \xrightarrow{H_2O} 'Y'</math> compound'Y' is
  2. (c) (d) (Term I, 2021-22) An

Enantiomers differ only in

  1. boiling point (b) rotation of polarised light
  2. melting point
  3. solubility. (Term I, 2021-22) (R)

Assertion (A): Chlorobenzene is less reactive

towards nucleophilic substitution reaction.

Reason (R): Nitro group in chlorobenzene increases

its reactivity towards nucleophilic substitution

reaction. (a) Both A and R are true and R is the correct

explanation of A.

(b) Both A and R are true and R is not the correct

explanation of A.

(c) A is true but R is false.

(d) A is false but R is true. (Term I, 2021-22) 1

The reaction given below:

is called (c)

  1. Wurtz reaction

Racemisation occurs in (c)

  1. S<sub>N</sub>2 reaction
  2. S<sub>N</sub>1 reaction

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

Out of the following, the one which is most reactive

towards nucleophilic substitution reaction is

  1. CH₂ = CH − CI
  2. C<sub>6</sub>H<sub>5</sub>−CI (c) CH<sub>3</sub>CH = CH - CI (d) CH<sub>3</sub>-CH<sub>2</sub>-CH<sub>2</sub>-CI (2020 C)

CH<sub>2</sub> — CI,

Frequently asked questions

What is this document?

This is a CBSE Class 12 Chemistry Previous Year Question Paper for the 2021-22 session, focusing on the chapter Haloalkanes and Haloarenes.

What types of questions are included?

The paper contains Multiple Choice Questions (MCQ), Very Short Answer (VSA) questions (1 mark), and Short Answer (SA) questions (2-3 marks).

Why is solving previous year papers important?

Solving previous year question papers helps students understand the exam pattern, identify important topics, and improve their score in the CBSE board exams.

What topics are covered in this paper?

The paper covers classification, nomenclature, preparation, physical properties, and chemical reactions of haloalkanes and haloarenes.

Which years/sessions are represented in this paper?

This paper includes questions from the 2021-22 session (Term I) and other previous years like 2013, 2014, 2015, 2016, 2017, 2019, 2020, and 2023.

Important links

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