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JEE Main levelSingle correct optionDifficulty 2 of 3si069

A compound $C X_{6} H X_{10}$ takes up only one mole of $H X_{2}$ per mole over Pd/C under mild conditions (rings are not opened) to give $C X_{6} H X_{12}$ . The compound contains

Atwo C=C bonds and no ring
Bone ring and one C=C bond
Cone C#C bond and no ring
Dtwo rings and no C=C bond

Answer: B

C X_{6} H X_{10}

has degree of unsaturation

(14 - 10) /2 = 2

. Only one mole of

H X_{2}

is absorbed, so only one pi bond is present. The second unit must be a ring.

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