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Byju's Answer
Standard XII
Chemistry
Reduction of Carboxylic Acids
Which of the ...
Question
Which of the following is optical rotatory?
A
C
H
3
C
H
C
l
C
O
O
H
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B
C
H
C
l
C
H
2
C
O
O
H
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C
C
H
2
O
H
C
H
2
C
O
O
H
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D
C
H
2
C
l
C
H
2
C
H
2
C
l
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Solution
The correct option is
A
C
H
3
C
H
C
l
C
O
O
H
In the compounds the presence
−
O
|
|
C
−
O
H
groups makes then difficult to rotate due to this double bonded oxygen
Hence,
C
l
−
C
H
2
−
C
H
2
−
C
H
2
−
C
l
is rotatary.
But, optical rotatavity
⇒
C
H
3
−
H
|
C
∗
|
C
l
−
C
O
O
H
c
h
a
r
a
l
c
a
r
b
o
n
C
H
3
C
H
C
l
C
O
O
H
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Fora reaction,
A
→
B
+
C
,
it was found that at the end of 10 minutes from the start, the total optical rotation of the system was
50
o
and when the reaction is complete, it was
100
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