how ch bond contain alot of energy

Bond energy is a measure of the stability of a molecule.
It is the enthalpy change required to break a particular bond in 1 mole of gaseous
molecules.

The experimentally determined bond energy of the
diatomic molecules are directly measurable quantities. For example, the bond energy for
H-Cl is 431.9 kJ/mol and for Cl-Cl is 242.7 kJ/mol. H-Cl bond energy is higher due to
hydrogen bonding.

However when we speak of the bond energy
for O-H and C-H bond, we are actually measuring the strength of covalent bonds in
polyatomic molecules since there are alot of compounds that contain O-H bond and C-H
bond.

Example CH4 (methane), C6H6 (benzene), CH3OH
(methanol)

The environment of each C-H bond per molecule is
not the same. Thus for polyatomic molecule we speak of the
average bond energy of a particular bond.

For example, we can measure the
energy of the C-H bond  in 10 different polyatomic molecules and obtain the average C-H
bond energy which is 414 kJ/mol. This value is large if we only consider the C-H bond
per se. But since the value is averaged over many compounds, we expect a value that is
not
accurate.