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The bond energies of C=C and C-C at 298 ...

The bond energies of `C=C` and `C-C` at `298 K` are `590` and `331 kJ mol^(-1)`, respectively. The enthalpy of polymerisation per mole of ethaylene is

A

`+259 kJ mol^(-1)`

B

`+ 72 kJ mol^(-1)`

C

`- 259 kJ mol^(-1)`

D

`- 72 kJ mol^(-1)`

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D
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