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IUPAC Nomenclature and Structural Isomerism
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Isomer counts and degree of unsaturation of drawn compounds
NEET level
Single correct option
Difficulty 1 of 3
nm263
What is the degree of unsaturation (rings plus pi bonds) of the compound shown?
A
2
B
3
C
4
D
5
Answer: B
The compound is cyclohex-2-en-1-one, C6H8O. Degree of unsaturation = (2 x 6 + 2 - 8)/2 = 3, matching one ring, one C=C and one C=O.
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