Bond energy is highest in the overlapping

$\mathrm{sp}-\mathrm{s}$ has the highest bond energy of overlapping.
- s orbitals hold electrons more tightly to the nucleus than p orbitals.
- The greater the s character, the closer are the electrons to the nucleus.
- The greater the s character, the shorter and stronger is the bond.
- Shorter and stronger bonds signify more overlapping between orbitals.
- Due to all these reasons,$$\begin{gathered} \mathrm{Bond} \mathrm{length} {\mathrm{SP}}^3 >{\mathrm{SP}}^2 >\mathrm{SP} \\ \mathrm{Bond} \mathrm{energy} {\mathrm{SP}}^3 <{\mathrm{SP}}^2 <\mathrm{SP} \end{gathered}$$