Arrange the following bonds according to their average bond energies in descending order:

C – Cl, C – Br, C – F, C - I

C – F < C – Cl < C – Br < C – I [order of bond length]

In this case bond energy $\propto \frac{1}{\text{Bond length}}$

Hence bond energy order is C – F > C – Cl > C – Br > C – I