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IUPAC Nomenclature and Structural Isomerism
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Classification and degree of unsaturation
NEET level
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nm004
What is the degree of unsaturation (number of rings plus pi bonds) of a compound of molecular formula
C
X
6
H
X
6
?
A
3
B
4
C
5
D
6
Answer: B
DU = (2C + 2 - H)/2 = (2x6 + 2 - 6)/2 = 4. This is the value for benzene, which has one ring and three C=C bonds.
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