1.

The bond energies of C-C, C=C, H-H and C-H linkages arev350, 600, 400 and 410 kJ per mol respectively. The heat of hydrogenation of ethylene is:

Answer»

`-170 KJ mol^-1`
`-260 kJ mol^-1`
`-400 kJ mol^-1`
`-450 kJ mol^-1`

Answer :A


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