CBSE Class 12 Chemistry Haloalkanes And Haloarenes Worksheet Set 03

Class 12 Chemistry Practice Set: Unit 6 Haloalkanes and Haloarenes

Access printable practice worksheets for Unit 6 Haloalkanes and Haloarenes designed to align with the 2026-27 academic syllabus for Class 12 Chemistry. These structured exercises help students evaluate their conceptual understanding and improve exam readiness.

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HALOALKANES AND HALOARENES
 
Multiple Choice Questions:
 
1 Identify optically active compound among the following:
1-Chlorobutane, 2-Chlorobutane,2-Methyl propane,propan-2-ol
 
2 Reagent that is used for diazotization is
a) Na+dry ether     b) Cl2+anhyAlCl3      c) NaNO2+HCl,278K       d) NaI in presence of dry acetone
 
3 The major product when 2-chloropentane is treated with alcoholic KOH is
a) Pent-1-ene         b) Pent-2-ene           c) Pentan-1-ol                d) Pentan-2-ol
 
4 The compound with lowest boiling point will be
a) Chloromethane   b) Bromomethane     c) Fluoromethane           d) Iodomethane
 
Fill in the blanks:
 
1 Chloroform is oxidized in presence of light to a poisonous gas called________.
 
2 ________ is used as an antiseptic by the liberation of free iodine.
 
3 The process of conversion of enantiomer to racemic mixture is known as__________.
 
4 Objects which form superimposable mirror images are termed to be_______.
 
5 Groups that possess two nucleophilic centers are called_________.
 
Assertion[A] & Reasoning[R]-
 
(A) Both assertion and reason are correct statements, and the reason is the correct explanation of the assertion
 
(B) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion
 
(C) Assertion is correct, but reason is wrong statement
 
(D) Assertion is wrong, but reason is correct statement
 
(E) Both assertion and reason are wrong statements
 
1 [A]: Haloalkanes react with KCN forms alkyl cyanides as major product.
   [R]: KCN is ionic and provides cyanide ions.
 
2 [A]: SN1 of an optically active alkyl halide is accompanied by racemization.
   [R]: As the nucleophile attacks the alkyl halide from the rear side to form an unstable intermediate.
 
3 [A]: Grignard reagents are prepared in anhydrous conditions.
   [R]: Grignard reagents are highly reactive.
 
4 [A]: Aryl halides are extremely reactive towards nucleophilic substitution reactions.
   [R]: C-X bond in aryl halides have a partial double bond which is difficult to cleave.
 
Answer the following questions
 
1 A solution of KOH hydrolyses CH3CHClCH2CH3 and CH3CH2CH2CH2Cl. Which one of these is more easily hydrolyzed?
 
2 Draw the structure of the following compounds:
 
a) 4- Bromo-3-methylpent-2-ene
 
b) 4-sec-butyl-1-chloromethyl-2-methylbenzene
 
c) 4-tert-Butyl-3-iodoheptane.
 
d) isohexyl bromide
 
e) neopentyl iodide
 
f) Allyl bromide
 
3 Write a chemical test to distinguish between:
 
a) Chlorobenzene and Benzyl chloride
 
b) Chloroethane and bromoethane
 
c) 1-Chloropropene and 3-chloropropene
 
4 An optically active compound having molecular formula C4H9Br reacts with aq. KOH to give a racemic mixture of products. Write the mechanism involved for the reaction.
 
5 Arrange in increasing order of property mentioned giving reasons:
 
a) Ethanol and ethyl chloride ( solubility in water)
 
b) 2-Bromo-2-methylbutane, 1-bromopentane, 2-bromopentane (reactivity towards SN2)
 
c) 2-Bromobutane, 2-Bromo-2-methylpropane, 1-Bromopropane and 1-Bromobutane.
(Boiling point)
 
6 Explain why?
 
a) Dipole moment of Chlorobenzene is lower than that of Cyclohexylchloride.
 
b) Alkyl halides, though polar are immiscible with water.
 
c) p-Dichlorobenzene has higher melting point and lower solubility than those of o and m-isomers.
 
d) 1-Chloropentane has more boiling point than 2-methyl-2-chlorobutane.
 
e) Vinyl chloride is less reactive than ethyl chloride towards SN reaction
 
7 How would you differentiate between SN1 and SN2 mechanisms of substitution? Give one example of each.
 
8 Write short note on the following:
 
a) Sandmeyer reaction
 
b) Finkelstein reaction
 
c) Wurtz reaction.
 
d) Fittig reaction
 
9 What happens when
 
a) Ethyl chloride is treated with NaI in the presence of acetone
 
b) Chlorobenzene is treated with Na metal in the presence of dry ether
 
c) Methyl chloride is treated with KNO2?
 
d) Ethyl chloride is treated with magnesium in dry ether followed by hydrolysis Write chemical equations in support of your answer.
 
10 Give the IUPAC name of the following:
 
a) (CH3)3CCH2CH(Br)C6H5
 
b) CH3C(C2H5)2CH2Br
 
c) CH3CH=C(Cl)CH2CH(CH3)2
 
d) CHF2CBrClF
 
e) (CH3)3CCH=CClC6H5
 
f) p-ClC6H4CH2CH(CH3)2
 
g) CH2 =C (CH3)CH2Br
 
11 Give reasons:
 
a) Alkyl halides have higher boiling points than corresponding hydrocarbons.
 
b) Benzylic and allylic halides follow SN1 mechanism.
 
c) Halogens are deactivating but ‘o, p’ directive.
 
d) Haloarenes cannot be prepared from alcohols
 
e) Presence of electron withdrawing groups on benzene ring increases tendency of SN reaction.
 
f) Con HNO3 or HIO4 is used for the preparation of iodo benzene.
 
g) Neo-pentylbromide undergoes nucleophilic substitution reactions very slowly.
 
12 Bring about the following conversions:
 
a) Benzene to 4-bromonitrobenzene
 
b) Benzyl alcohol to 2-phenylethanoic acid
 
c) Toluene to benzylalcohol

 

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Exam Preparation Worksheet for Class 12 Chemistry Unit 6 Haloalkanes and Haloarenes

Unit 6 Haloalkanes and Haloarenes Printable Worksheet for Class 12 Chemistry

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Yes, our CBSE Class 12 Chemistry Haloalkanes And Haloarenes Worksheet Set 03 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 12.

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