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Question
Chemistry
Which one of the following is used to obtain the maximum percentage of terminal alkene by dehydrohalogenation of CH 3 CH 2 C ( CH 3)2 Br ?
Q. Which one of the following is used to obtain the maximum percentage of terminal alkene by dehydrohalogenation of
C
H
3
C
H
2
C
(
C
H
3
)
2
B
r
?
1328
173
TS EAMCET 2019
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A
Sodium ethoxide in ethanol
B
Potassium ethoxide in ethanol
C
Potassium tert-butoxide in tert-butyl alcohol
D
Potassium alkoxide derived from 3-ethyl-3-pentanol in
H
O
−
C
(
C
2
H
5
)
3
Solution:
So, in this reaction potassium tert-butoxide in tert-butyl alcohol
[
(
C
H
3
)
3
C
O
−
K
+
in
(
C
H
3
)
3
CO
H
]
is
used to obtain the maximum percentage of terminal alkene by dehydrohalogenation of
C
H
3
C
H
2
C
(
C
H
3
)
2
B
r
.
Note
When a more hindered base is used, more of the thermodynamically less favoured terminal alkene is generated.
If we will use other base then the reaction takes place as follows:
