The bond dissociation energies of X2 , Y2 and XY are in the ratio of 1 : 0.5 : 1. H for the formation of XY is -200 kJ mol -1 . The bond dissociation energy of X2 will be

1. A. 800 kJ mol -1
2. B. 100 kJ mol -1
3. C. 200 kJ mol -1
4. D. 400 kJ mol -1

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