The bond dissociation energies of X_2, Y_2 and XY are in the ratio of 1: 0.5: 1. Δ H for the formation of XY is -200 kJ mol ^-1. The bond…

The bond dissociation energies of $\displaystyle \mathrm{X}_2, \mathrm{Y}_2$ and XY are in the ratio of $\displaystyle 1 : 0.5 : 1. \Delta \mathrm{H}$ for the formation of XY is -$\displaystyle 200$ kJ mol $\displaystyle { }^{-1}$. The bond dissociation energy of $\displaystyle \mathrm{X}_2$ will be