Class 12 Chemistry NCERT Exemplar Solutions: Chapter 10, Haloalkanes and Haloarenes

The replacement of hydrogen atom(s) in hydrocarbon, aliphatic or aromatic compounds, by halogen atom(s) results in the formation of alkyl halide (haloalkane) and aryl halide (haloarene), respectively.

Class 12 Chemistry NCERT chapter, Haloalkanes and Haloarenes, explains the chemistry of these compounds including their classification, nomenclature, structures and properties. Various name reactions are also involved in this chapter which are very important for boards as well as competitive exams. Some of these reactions are: Finkelstein Reaction, Swarts Reaction, Hundsdiecker Reaction, Sandmeyer’s Reaction, Gattermann Reaction, Wurtz Fittig Reaction and Fittig Reaction.

Class 12 Chemistry NCERT Exemplar Problems: Haloalkanes and Haloarenes

Class 12 Chemistry NCERT Exemplar book contains various questions based on the conceptual topics explained in the chapter, Haloalkanes and Haloarenes. It includes a number of questions based on the structures of different halo compounds and also on the important name reactioms. Solving the NCERT Exemplar problems for class 12 chapter- Haloalkanes and Haloarenes will help students to analyse that how well they have grasped the concepts and theories explained in this chapter. There are given some higher order thinking skill questions which are designed to test a student's analytical approach to the concepts explained in this chapter.

Class 12 Haloalkanes and Haloarenes: Get appropriate NCERT Exemplar solutions

To help students find the right and straight approach to the NCERT Exemplar problems for Class 12 Chemistry chapter - Haloalkanes and Haloarenes, we are providing the accurate solutions that explained by the subject exeperts. All the questions have been solved in the most appropriate and simple way. To help students easily understand the concepts involved in a solution, structures and chemical equations have been used appropriately wherever required.

The NCERT Exemplar solutions provided here will prove to be an irreplaceable source of study while preparing for the board exams as well as for the entrance tests.

All the class 12 Chemistry NCERT Exemplar solutions have been collated in PDF format which students may easily download for absolutely free. 

Few problems along with their solutions from this chapter are given below:

Q. Ethylidene chloride is a/an…….

(a) vic-dihalide                                  (b) gem-dihalide             

(c) allylic halide                                  (d) vinylic halide

Ans. (b) gem-dihalide

In vic-dihalides, halongen atoms are present on the adjacent carbon atoms.

In gem-dihalides, halogen atoms are present on the same carbon atom. They are known as alkylidene halides

In allylic halides, halogen atom is bonded to sp³ hybridised carbon atom next to carbon-carbon double bond.

In vinylic halides, halogen atom is bonded to sp² hybridised carbon atom of a carbon-carbon double bond.

In ethylidene chloride (H₃C—CHCI₂) both halogen atoms are present on same carbon atom so it is gem-dihalide.

CBSE Class 12 Chemistry Syllabus 2018 – 2019

Q. Which of the following statements are correct about the mechanism of this reaction?

(a) A carbocation will be formed as an intermediate in the reaction

(b) OH⁻ will attach the substrate (ii) from one side and Cl⁻ will leave it simultaneously from other side

(c) An unstable intermediate will be formed in which OH⁻ and Cl⁻ will be attached by weak bonds

(d) Reaction proceeds through S_N1 mechanism

Ans. (a, d)

The reactant Involve above reaction is secondary alkyl halide. This 2° alkyl halide contain bulky group that’s why it follow S_N1 mechanism instead of S_N² mechanism. In S_N² mechanism S_N¹ mechanism, a stable carbocation will be formed as an intermediate. It is further attacked by OH⁻ nucleophile.

Q. What are the IUPAC names of the insecticide DDT and benzene hexachloride? Why is their use banned in India and other countries?

Ans. The IUPAC name of DDT is 2,2-bis (4-chlorophenyl)-1,1,1-trichloroethane and that of benzene hexachloride is 1,2,3,4,5,6-hexachlorocyclohexane.

They are banned in India because they are non-biodegradable. Instead, they get deposited and stored in fatty tissues. If this ingestion continues at a steady rate, DDT builds up within the animal over time. This will affect the reproductive system of animals.

If animals including humans are exposed to high levels of benzene hexachloride then it may cause acute poisoning. Apart from that this BHC may affect liver functioning in humans.

Find below the links to download Class 12 Chemistry NCERT Exemplar Solutions for chapter 10- Haloalkanes and Haloarenes:

Class 12 Chemistry NCERT Solutions: All Chapters

Class 12 Chemistry NCERT Exemplar Problems: Haloalkanes and Haloarenes

NCERT Exemplar book for class 12 Chemistry consists of a collection of Higher Order Thinking Skill (HOTS) questions which will help students to build their strength towards reasoning type questions.

A few significant benefits of NCERT Exemplar Problems are:

• Offers different question-variations
• Develops in-depth concepts
• Questions are strictly based on the CBSE curriculum
• Helps to prepare for board and competitive exams

Therefore, it’s very important for students to practice the NCERT exemplar problems to prepare well for the boards and the competitive exams.

In this article, we are providing the NCERT Exemplar Problems for Class 12 Chemistry chapter – Haloalkanes and Haloarenes, in the PDF format which students may download and solve them to analyse their preparedness for the exams.

Important topics discussed in Class 12 Chemistry chapter – Haloalkanes and Haloarenes, are:

• Classification of Haloalkanes and Haloarenes
• Nomenclature
• Nature of C-X Bond
• Methods of Preparation
• Physical Properties
• Chemical Reactions
• Polyhalogen Compounds.

Download the complete NCERT Exemplar problems from the following link:

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