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JEE Main levelSingle correct optionDifficulty 2 of 3pl204

Complete catalytic hydrogenation of natural rubber saturates every $C = C$ . The molar mass of the saturated repeat unit (C 12, H 1) is

A66
B68
C70
D72

Answer: C

The unsaturated repeat unit

C X_{5} H X_{8}

has one

C = C

and adds one

H X_{2}

to become

C X_{5} H X_{10}

. Its mass is

5 \times 12 + 10 = 70

.

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