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Byju's Answer
Standard XII
Chemistry
Physical Properties of Alkenes
The addition ...
Question
The addition of
B
r
2
to trans 2-butene produces
:
A
(+) 2,3-dibromo butane
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B
(-) 2,3-dibromo butane
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C
racemic - 2,3-dibromo butane
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D
meso - 2,3-dibromo butane
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Solution
The correct option is
B
meso - 2,3-dibromo butane
Addition of
B
r
2
to alkene is an anti-addition reaction.
So, the addition of
B
r
2
to trans 2-butene will produce meso - 2,3-dibromobutane.
Option D is correct.
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Similar questions
Q.
Assertion :Addition of
B
r
2
in
C
C
I
4
to trans-
2
-butene gives a mesa form of
2
,
3
-dibromo butane. Reason: The cyclic harmonium ion formed has a plane of symmetry.
Q.
S
t
a
t
e
m
e
n
t
: 2-butyne reaccts with one equivalent of
B
r
2
in
C
C
l
4
to produce cis-2,3-dibromo-2-butene.
If true enter 1, if false enter 0.
Q.
What is the product of the reaction of 1, 3-butadiene with
B
r
2
Q.
Dehalogenation of meso-2, 3-dibromo-butane results in
Q.
Write the structural formula of:
(a) o-Ethylanisole
(b) p-Nitroaniline
(c) 2,3 - Dibromo -1 - phenylpentane
(d) 4-Ethyl-1-fluoro-2-nitrobenzene.
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