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Chemical Bonding And Molecular Structure

Question
CBSEENCH11005810

Define bond length.

Solution
Bond length: Bond length is defined as the equilibrium internuclear separation distance of the bonded atoms in a molecule. Each atom of the bonded pair contributes to the bond length. 

In the case of a covalent bond, the contribution from each atom is called covalent radius of that atom.
The bond length in a covalent molecule AB
R = r A + r B
where R is the bond length; rAand rB are the covalent radii of atoms A and B respectively.