Question

Which of the following bonds has the highest bond energy?
A.$F-F$
B.$N-N$
C.$C-C$
D.$O-O$

Answer 1

Bond energy is defined as the amount of energy required to break apart a mole of molecules into its component atoms. It is a measure of the strength of a chemical bond.

Complete answer:
- Bond energy is also known as bond enthalpy bond enthalpy (H) or simply as bond strength.
- It depends upon the name of bonds, electronegativity of atoms forming the bond and the size of atoms.
- Bond energy is based on an average of bond dissociation values for species in the gas phase, typically at a temperature of 298 Kelvin.
- It may be found by measuring or calculating the enthalpy change of breaking a molecule into its component atoms and ions and dividing the value by the number of chemical bonds.
- A C-C bond does not have any lone pair of electrons, and thus inter electron repulsion does exist. Therefore, it has the highest bond energy.
- The double bond between C and C atom is stronger as it is a pure covalent bond. The extent of overlapping is good, but the main factor is electronegativity difference between forming bonds.

Therefore, the answer to the question is (C).

Note:
If the bond energy is more, the bond will easily break that means it is having very less bond strength. If the bond length is more, bond energy will be more, and bond strength will be less. As the atomic size increases, bond length increases.