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Structural Identification and Practical Organic Chemistry
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Degree of unsaturation and spectroscopic clues
JEE Main level
Single correct option
Difficulty 2 of 3
si067
The degree of unsaturation of
C
X
7
H
X
7
NO
X
2
is
A
5
B
3
C
4
D
6
Answer: A
Nitrogen adds 1/2 each:
(
2
×
7
+
2
+
1
−
7
)
/2
=
5
. For example 4-nitrotoluene has a ring (1 ring + 3 C=C = 4) and the N=O of the nitro group (1).
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