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Byju's Answer
Standard XII
Chemistry
Preparation of Alcohols from Alkenes
2 H2C=CH-CH...
Question
2)
H
2
C
=
C
H
−
C
H
2
−
+
C
H
−
C
H
3
3)
H
3
C
−
C
H
3
|
C
|
C
H
3
−
+
C
H
2
Write these carbocations in decreasing order of their stabilities.
A
I
>
I
I
>
I
I
I
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B
I
I
>
I
I
I
>
I
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C
I
I
I
>
I
>
I
I
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D
I
>
I
I
I
>
I
I
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Solution
The correct option is
A
I
>
I
I
>
I
I
I
The stability of carbocations will be according to the following order
I
>
I
I
>
I
I
I
In II there are 5 alpha hydrogens will show hyperconjugation, so II is more stable than III.
As,benzyl carbocation is the most stable due to resonance and primary carbocation is the least stable.
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Similar questions
Q.
Arrange the following compounds in decreasing order of acidity -
(i)
H
C
≡
C
H
(
ii)
H
2
C
=
C
H
2
(iii)
H
3
C
−
C
H
3
Q.
Decreasing order of stability of following alkenes is..
(i)
C
H
3
−
C
H
=
C
H
2
(ii)
C
H
3
−
C
H
=
C
H
−
C
H
3
(iii)
C
H
3
−
C
|
C
H
3
=
C
H
−
C
H
3
(iv)
C
H
3
−
C
H
3
|
C
=
C
H
3
|
C
−
C
H
3
Q.
Which of the following is the correct decreasing order of the stability using concept of inductive effect?
(
i
)
C
H
3
−
+
C
H
−
C
H
2
−
O
C
H
3
(
i
i
)
C
H
3
−
+
C
H
−
C
H
2
−
C
H
3
(
i
i
i
)
C
H
3
−
+
C
H
−
O
|
|
C
−
C
H
3
Q.
What is the correct order of decreasing stability of the following cations?
I
−
C
H
3
−
∗
C
H
−
C
H
3
I
I
−
C
H
3
−
∗
C
H
−
O
C
H
3
I
I
I
−
C
H
3
−
∗
C
H
−
C
H
2
−
O
C
H
3
Q.
Consider the following carbocations
I.
C
H
3
−
C
⨁
H
2
II.
C
H
2
=
C
⨁
H
III.
C
H
2
=
C
H
−
C
⨁
H
2
IV.
C
6
H
5
−
C
H
⨁
2
Stability of these carbocations in decreasing order is?
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