Haloalkanes and Haloarenes: Class 12 Chemistry (CBSE) important questions and practice
Haloalkanes and Haloarenes is chapter 6 of 10 in CBSE Class 12 Chemistry. Below are the topics the paper draws from, the question types that come up again and again, and a free practice test on this chapter alone.
Topics in this chapter
- Classification and nomenclature of haloalkanes and haloarenes
- Preparation: from alcohols, hydrocarbons, halogen exchange (Finkelstein, Swarts)
- Nucleophilic substitution: SN1 and SN2 mechanisms, stereochemistry, optical activity
- Elimination reactions and Saytzeff rule
- Reaction with metals: Grignard reagent, Wurtz reaction
- Haloarenes: electrophilic substitution, low reactivity towards nucleophiles, directive influence of halogen
- Polyhalogen compounds: DDT, chloroform, iodoform, freons
What examiners usually ask
- Explain the SN1 and SN2 mechanisms with examples and state which is favoured by tertiary halides
- Why is chlorobenzene less reactive than chloroethane towards nucleophilic substitution?
- Arrange CH3Cl, CH3Br, CH3I in increasing order of boiling point and explain; what is a racemic mixture?
Exam tip
Draw the SN2 transition state and SN1 carbocation, note that SN2 gives inversion and SN1 gives racemisation, and write the resonance structures of chlorobenzene to explain its low reactivity; these three answers are set almost every year.
Haloalkanes and Haloarenes on other boards and exams
Frequently asked questions
What are the important questions from Haloalkanes and Haloarenes for CBSE Class 12?
The question types listed above repeat most often in CBSE Class 12 Chemistry papers for this chapter. Practise them with the chapter test and then attempt them inside a full previous-year paper under time.
Is Haloalkanes and Haloarenes in the CBSE Class 12 Chemistry syllabus?
Yes. Haloalkanes and Haloarenes is part of the current CBSE Class 12 Chemistry syllabus, as listed on this site from the prescribed textbook.
Can I practise Haloalkanes and Haloarenes MCQs in Hindi?
Yes. The chapter test and explanations are available in Hindi and English, with an AI doubt solver for any question.