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Standard XII
Chemistry
Dehydration of Alcohols
Question
Which of the following alcohols will dehydrate most rapidly when treated with conc.
H
2
S
O
4
?
C
H
3
C
H
(
O
H
)
C
(
C
H
3
)
3
(
C
H
3
)
2
C
H
C
H
(
O
H
)
C
H
3
C
H
3
C
H
2
C
H
2
C
H
2
O
H
C
H
3
C
(
C
H
3
)
(
O
H
)
C
H
(
C
H
3
)
2
A
C
H
3
C
H
(
O
H
)
C
(
C
H
3
)
3
B
C
H
3
C
H
2
C
H
2
C
H
2
O
H
C
C
H
3
C
(
C
H
3
)
(
O
H
)
C
H
(
C
H
3
)
2
D
(
C
H
3
)
2
C
H
C
H
(
O
H
)
C
H
3
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Solution
Verified by Toppr
The speed of dehydration will be proportional to the stability of carbo-cation formed after the protonated
−
O
H
group leaves.
Thus for option (B), the carbo-cation would be (in the figure).
This is the most stable carbo-cation since it is on a
3
°
carbon. The reaction will proceed big E1 mechanism.
Therefore, option B is correct.
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