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The bond enthalpies of C-C,C=C and C=C b...

The bond enthalpies of `C-C`,`C=C` and `C=C` bonds are 348, 610 and 835 kj`//` mole respectively at 298 K and 1 bar . Calculate enthalpy of polymerisation per mole of butyne at 298 K and 1 bar :

A

`-123 kJ`

B

`-132 kJ`

C

`-139 kJ`

D

`-37 kJ`

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A
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