Question

which of the following has highest bond energy and why?

O-O

Se-Se

Te-Te

S-S

Answer 1

Dear student!

The answer is S-S bond, it is because sulphur forms stronger covalent bond than Se and Te and the S-S bond is stabilized by pπ-dπ bonding which is absent in O-O (due to absence of d-orbtals) and less effective in Se and Te due to full filled d-orbitals.

Also, the non bonding electron pair of O-O bonds have strong repulsion which makes it weak in comparison with S-S bond.

So, the S-S bond has highest bond energy.