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Structural Identification and Practical Organic Chemistry
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Degree of unsaturation and spectroscopic clues
JEE Advanced level
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Difficulty 3 of 3
si099
Which of the following have a degree of unsaturation equal to 5?
A
benzoyl chloride,
C
X
6
H
X
5
COCl
B
acetophenone,
C
X
6
H
X
5
COCH
X
3
C
nitrobenzene,
C
X
6
H
X
5
NO
X
2
D
cumene,
C
X
6
H
X
5
CH
(
CH
X
3
)
X
2
Answer: A, B, C
C
X
7
H
X
5
ClO
:
(
16
−
5
−
1
)
/2
=
5
.
C
X
8
H
X
8
O
:
(
18
−
8
)
/2
=
5
.
C
X
6
H
X
5
NO
X
2
:
(
14
+
1
−
5
)
/2
=
5
. Cumene
C
X
9
H
X
12
:
(
20
−
12
)
/2
=
4
(only the ring and three C=C).
Practice Structural Identification and Practical Organic Chemistry
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