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JEE Main levelSingle correct optionDifficulty 2 of 3si227

The compound shown has no multiple bonds. Its degree of unsaturation, equal to the number of rings, is

A $4$
B $5$
C $6$
D $8$

Answer: B

The compound shown is cubane,

C X_{8} H X_{8}

. DBE

= (2 \times 8 + 2 - 8) /2 = 5

, so five rings must be present (the six faces of the cube give only five independent rings). Counting six faces gives 6, which is the common error.

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