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IUPAC Nomenclature and Structural Isomerism
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Classification and degree of unsaturation
JEE Advanced level
Single correct option
Difficulty 3 of 3
nm024
A compound of formula
C
x
H
12
ClN
has a degree of unsaturation of 6. What is the value of
x
?
A
12
B
9
C
10
D
11
Answer: D
DU = (2x + 2 + N - H - X)/2 = (2x + 2 + 1 - 12 - 1)/2 = (2x - 10)/2 = x - 5. Setting x - 5 = 6 gives x = 11. Check: C11H12ClN has (22 + 2 + 1 - 12 - 1)/2 = 6.
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