JEE Main 2021 — Haloalkanes And Haloarenes Question with Solution
From: JEE Main 2021 (Online) 26th August Morning Shift
Question
The major product formed in the following reaction is :
This question includes a diagram. The text above accompanies the figure.
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
This addition is known as 1, 4-addition.
Mechanism This reaction can undergoes two pathways
Out of the two intermediates formed in two paths, the path B intermediate is more stable as it has more stable carbocation. So, a major product will be formed because of path B.
1, 2-addition product is formed at low temperature and will be less stable as the double bond is less substituted. 1, 4-addition is a thermodynamically stable product as the double bond is more substituted. As diene is in excess and HBr is limited in reaction, so diene cannot be formed. So option (b) is incorrect.
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This is a previous-year question from JEE Main 2021, covering the Haloalkanes And Haloarenes chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.