Question

Arrange the following bonds in the decreasing order of their bond length H-F, H-I, H-Br, H-Cl.

Answer 1

Dear Student,

The decreasing order of bond length is :
HI > HBr > HCl > HF
This is because as we go down the group, the size of the atom increases i.e. atomic radius increases which in turn increases the bond length as bond length is directly proportional to atomic radius.
This is because here the cation is same i.e. H⁺ , as the size of anion increases, the effective overlap or orbitals of H and halogen decreases ​and therefore, bond length also increases.