Question

Which of the following has maximum bond energy?

• A. $C=C$
• B. $C=O$
• C. $O=O$
• D. $N=O$

Answer 1

The correct option is B $C=O$

The amount of energy required to break one mole of bonds of a particular type between two atoms is called bond dissociation energy or bond energy.

Bond energy of $C=O$ is $745$ $kJmo{l}^{-1}$.

Bond energy of $N=O$ is $607$ $kJmo{l}^{-1}$.

It can be explained as:

Higher is the bond length, lower will be its bond energy. Further, bond length depends upon the number of the lone pairs of electrons present on the bonded atoms. Greater the number of lone pairs of electrons present on the bonded atoms, greater is the repulsion between the atoms and hence less is the bond energy.

$\stackrel{0}{C}=\stackrel{2}{O};\stackrel{1}{N}=\stackrel{2}{O}$

Whereas, $C=C$ and $O=O$ are non-polar bonds thus have less bond energy than polar bonds.