The bond energies (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of $\mathrm{P}-\mathrm{H}$, As- $-\mathrm{H}$ and…
The bond energies (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of $\mathrm{P}-\mathrm{H}$, As- $-\mathrm{H}$ and $\mathrm{N}-\mathrm{H}$ are respectively
247,389 and 318
247,389 and 318
318,389 and 247
318,247 and 389
Solution
Decreasing order of these hydrides is
$
\mathrm{N}-\mathrm{H}>\mathrm{P}-\mathrm{H}>\mathrm{As}-\mathrm{H}
$
Bond energies $389>318>247$ (decreases with increase in bond lengths)