Question

If a molecule $M{X}_3$ has zero dipole moment, the sigma bonding orbitals used by M (atomic no.< 21) are:

• A. pure p
• B. sp hybrid
• C. $s{p}^2$ hybrid
• D. $s{p}^3$ hybrid

Answer 1

The correct option is C $s{p}^2$ hybrid

Since atomic number is less than 21, d orbitals are not present.

When the atom M undergoes $s{p}^2$ hybridization, the molecule has triagonal planar geometry and has zero dipole moment as the bond dipoles cancel.