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Byju's Answer
Standard XII
Chemistry
Dehydration of Alcohols
Which of the ...
Question
Which of the following gives the most stable carbocation by dehydration?
A
(
C
H
3
)
2
C
H
−
O
H
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B
(
C
H
3
)
3
C
−
O
H
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C
C
H
3
−
C
H
2
−
O
H
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D
C
H
2
=
C
H
−
O
H
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Solution
The correct option is
A
(
C
H
3
)
3
C
−
O
H
Tert-Butanol gives the most stable carbocation by dehydration.
(
C
H
3
)
3
C
−
O
H
→
(
C
H
3
)
3
C
+
.
This is because the tert-butyl carbocation is stabilized by the
+
I
effect of three methyl groups. (stabilised by hyperconjugation also)
Option B is correct.
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Similar questions
Q.
(A)
C
H
3
−
C
|
C
H
3
H
−
C
H
2
−
C
H
2
−
O
H
(B)
C
H
3
−
O
H
|
C
|
C
H
3
−
C
H
2
−
C
H
3
(C)
C
H
3
C
H
3
|
C
H
−
O
H
|
C
H
−
C
H
3
The order of given alkanols
A
,
B
,
C
in their reactivity towards acid catalysed dehydration is:
Q.
Assertion :
C
H
3
C
H
3
|
|
C
H
3
−
C
−
C
H
2
−
B
r
+
N
a
O
H
⟶
C
H
3
−
C
−
C
H
2
−
C
H
3
|
|
C
H
3
O
H
Reason: It follows with formation of more stable carbocation.
Q.
In which of the following pairs of carbocations, the first carbocation is more stable than the second?
(i)
C
H
2
=
C
H
−
+
C
H
2
and
C
H
2
=
C
H
−
C
H
2
−
+
C
H
2
(ii)
C
H
3
−
N
H
−
+
C
H
2
and
+
C
H
2
−
O
H
(iii)
C
H
3
−
O
−
C
H
2
−
+
C
H
2
and
C
H
2
−
O
−
+
C
H
2
(iv)
C
H
3
−
+
C
H
−
C
H
2
C
H
2
C
H
3
and
C
H
3
C
H
2
−
+
C
H
−
C
H
2
C
H
3
Q.
Which of the following would you predict to be the stronger acid?
(a) Benzoic acid or para-nitrobenzoic acid
(b)
C
H
3
−
C
H
2
−
C
H
2
−
O
H
or
C
H
3
−
C
H
=
C
H
−
O
H
(c)
C
H
3
−
C
H
=
C
H
−
C
H
2
−
O
H
or
C
H
3
−
C
H
=
C
H
−
O
H
Q.
The order of reactivity of following alcohols with halogen acids is:
(A)
C
H
3
C
H
2
−
C
H
2
−
O
H
(B)
C
H
3
−
C
H
2
−
C
|
C
H
3
H
−
O
H
(C)
C
H
3
−
C
H
2
−
C
H
3
|
C
|
C
H
3
−
O
H
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