Chemistry · PYQ NEET UG 2018

The bond dissociation energies of \( \mathrm{X}_{2}, \mathrm{Y}_{2} \) and \( \mathrm{XY} \) are in the ratio of \( 1:0.5:1 \). \( \Delta \mathrm{H} \) for the formation of \( \mathrm{XY} \) is \( -200 \mathrm{~kJ} \mathrm{~mol}^{-1} \). The bond dissociation energy of \( \mathrm{X}_{2} \) will be

1. A
   \( 200 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
2. B
   \( 100 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
3. C
   \( 800 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
4. D
   \( 400 \mathrm{~kJ} \mathrm{~mol}^{-1} \)