Which one of the following bonds has the highest bond energy?

Which multiple bonds are present in $CO_{2}$,$C_{2}H_{4}$,$N_{2}$,and $C_{2}H_{2}$? Draw the Lewis and simple bond structures of these molecules.

The major binding force of diamond,silicon and quartz is

The $B-F$ bond dissociation energy in $BF_3$ is $646 \ kJ \ mol^{-1}$,whereas the $C-F$ bond dissociation energy in $CF_4$ is $515 \ kJ \ mol^{-1}$. Which of the following is the correct reason for the $B-F$ bond dissociation energy being higher than the $C-F$ bond dissociation energy?

Which of the following bonds has the highest bond enthalpy?

Which of the following compounds is covalent?