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JEE Main levelSingle correct optionDifficulty 2 of 3si225

What is the degree of unsaturation of the compound shown?

A $5$
B $6$
C $7$
D $8$

Answer: C

The compound shown is naphthalene,

C X_{10} H X_{8}

: two fused rings and five C=C bonds in the Kekule structure, so

2 + 5 = 7

. Formula check:

(22 - 8) /2 = 7

. Counting only five C=C and forgetting the rings gives the distractor 5.

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