If a molecule $M X_{3}$ has zero dipole moment, the sigma bonding orbitals used by $M$ (atomic numbe

Question

If a molecule $M X_{3}$ has zero dipole moment, the sigma bonding orbitals used by $M$ (atomic number < 21) are\

Professor PC Thomas Classes · Answer

(c) : Molecule $M X_{3}$ would be symmetrical and thus non-polar ( $\mu=0$ ) only if $M$ is $s p^{2}$ hybridised.