Q. What is the product of the reaction of 1, 3-butadiene with $Br_{2}$?
A) 1, 4-dibromo butene
B) 1, 2- dibromo butene
C) 3, 4- dibromo butene
D) 2, 3- dibromo-2-butene
Explanation
(a)
$CH_{2} = CH - CH = CH_{2} + Br_{2} \longrightarrow$
1,3-butadiene
(i)$CH_{2} = CH - CH - CH_{2}$
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Br Br
3,4-dibromo butane
(ii) $CH_{2} - CH = CH - CH_{2}$
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Br Br
1,4-dibromo-2-butene
1,4-adduct is more stable than the 1,2-adduct.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.