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Byju's Answer
Standard XII
Chemistry
Carbocation
A CH3-CH2-⊕...
Question
A)
C
H
3
−
C
H
2
−
⊕
C
H
2
B)
C
H
3
−
C
H
|
F
−
⊕
C
H
2
C)
C
H
3
−
C
H
|
B
r
−
⊕
C
H
2
D)
C
H
3
−
C
H
|
C
l
−
⊕
C
H
2
Arrange the following carbocations in decreasing order of their stability:
A
A
>
B
>
C
>
D
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B
A
>
C
>
D
>
B
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C
B
>
A
>
C
>
D
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D
D
>
B
>
C
>
A
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Solution
The correct option is
D
A
>
C
>
D
>
B
Stability of carbocation
∝
1
−
I
e
f
f
e
c
t
So, an order of stability will be,
A
>
C
>
D
>
B
Fluorine has a maximum
−
I
effect, so it will be unstable carbocation.
Suggest Corrections
4
Similar questions
Q.
Select the member of each pair that shows faster rate of
S
N
2
reaction with
K
I
in acetone.
(a)
C
H
3
−
C
H
2
−
C
H
2
−
C
H
2
−
C
l
a
n
d
C
H
3
−
C
H
∣
C
H
3
−
C
H
2
−
C
l
(
I
)
(
I
I
)
(b)
C
H
3
−
C
H
2
−
C
H
2
−
C
l
a
n
d
C
H
3
−
C
H
2
−
C
H
2
−
B
r
(
I
)
(
I
I
)
(c)
C
H
3
−
C
H
∣
C
H
3
−
C
H
2
−
C
H
2
−
C
l
a
n
d
C
H
3
−
C
H
3
∣
C
∣
C
H
3
−
C
H
2
C
l
(
I
)
(
I
I
)
(d)
C
H
3
−
C
H
2
−
C
H
2
−
B
r
∣
C
H
−
C
H
3
a
n
d
C
H
3
−
C
H
3
∣
C
H
−
C
H
2
−
B
r
∣
C
H
−
C
H
3
(
I
)
(
I
I
)
Q.
In the given example B,C and B,D are
:
(a)
C
H
3
−
C
H
2
−
C
H
2
−
C
H
2
N
H
2
Butanamine
(
1
o
)
(b)
C
H
3
−
C
H
2
−
N
H
2
|
C
H
−
C
H
3
Butan-2-amine
(
1
o
)
(c)
C
H
3
−
C
H
3
|
C
H
−
C
H
2
−
N
H
2
2-Methylpropanamine
(
1
o
)
(d)
C
H
3
−
C
H
3
|
C
|
−
C
H
3
N
H
2
2-methylpropan-2-amine
(
1
o
)
(e)
C
H
3
−
C
H
2
−
C
H
2
−
N
H
−
C
H
3
N-methylpropanamine
(
2
o
)
Q.
Pick out the correct reactions:
A
.
C
H
3
−
C
H
=
C
H
2
+
H
C
l
⟶
C
H
3
−
C
|
C
l
H
−
C
H
3
B
.
C
H
3
−
C
H
=
C
H
2
+
H
B
r
⟶
C
H
3
−
C
H
2
−
C
H
2
B
r
C
.
C
H
3
−
C
H
=
C
H
2
+
H
B
r
p
e
r
o
x
i
d
e
−
−−−−
→
C
H
3
−
C
H
2
−
C
H
2
−
B
r
D
.
C
H
3
−
C
H
=
C
H
2
+
H
I
p
e
r
o
x
i
d
e
−
−−−−
→
C
H
3
−
C
|
I
H
−
C
H
3
Q.
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.
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:
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