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Byju's Answer
Standard XII
Chemistry
Preparation of Alkyl Halides
CH3-CH2-C≡ CH...
Question
C
H
3
−
C
H
2
−
C
≡
C
H
A
→
B
C
H
3
C
≡
C
−
C
H
3
In the above given reaction,
A
and
B
respectively are
A
alcoholic
K
O
H
and
N
a
N
H
2
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B
N
a
N
H
2
and alcoholic
K
O
H
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C
N
a
N
H
2
and Lindlar's catalyst
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D
Lindlar's catalyst and
N
a
N
H
2
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Solution
The correct option is
C
alcoholic
K
O
H
and
N
a
N
H
2
This is isomerisation of alkyne.
The reactions are:
C
H
3
−
C
H
2
−
C
≡
C
H
a
l
c
.
K
O
H
−
−−−−
→
C
H
3
C
≡
C
−
C
H
3
C
H
3
C
≡
C
−
C
H
3
N
a
N
H
2
−
−−−−
→
C
H
3
−
C
H
2
−
C
≡
C
H
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Q.
In the reaction of
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2
−
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−
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≡
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the reagent 'X' is
Q.
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e
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l
e
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d
o
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i
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H
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2
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s
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d
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N
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N
H
2
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C
H
3
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H
2
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H
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2
,
(
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−
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l
e
)
P
d
o
r
N
i
(
4
)
N
a
N
H
2
;
C
H
3
C
H
2
C
H
2
B
r
:
B
H
3
,
H
2
O
2
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O
H
−
Q.
Arrange the following alkyl halides in decreasing order of the rate of
β
-elimination reaction with alcoholic
K
O
H
.
(I)
C
H
3
−
H
|
C
|
C
H
3
−
C
H
2
B
r
(II)
C
H
3
−
C
H
2
−
B
r
(III)
C
H
3
−
C
H
2
−
C
H
2
−
B
r
Q.
The correct decreasing order of following alkyl halides according to the rate of
β
- elimination reaction with alcoholic KOH will be:
(i)
C
H
3
−
H
|
C
|
C
H
3
−
C
H
2
B
r
(ii)
C
H
3
−
C
H
2
−
B
r
(iii)
C
H
3
−
C
H
2
−
C
H
2
−
B
r
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