Question

how to calculate bond length

Answer 1

we can calculate bond length if we know the bond angle or interelectronic repulsions...

bond length inversely proportional to bond angle.

Lone pair-lone pair > Lone pair- bond pair> Bond pair-Bond pair( repulsion order)

Answer 2

Bond order is inversely proportional to Bond length.  so,when the bond order is increase then the bond length is decrease and  Bond length is the distance between the two atom form by covalent bond in the compound  And Bond length is also inversely proportional to Bond strength means when the body strength between the two atom is increased then the value of bond is length is decreases.