Question

the geometry and hybridization of the following that will convey a non-zero dipole on them

(I) a molecule with six steric number (number of electrons on the central atoms) of which two are bonded electrons and four is non bonded

(ii) a molecule with five steric number of which three are bonded electrons and two is non bonded by

Answer 1

(a) molecule with six steric number (number of electrons on the central atoms) of which two are bonded electrons and four is non bonded 

Steric number - 6 (6 electron groups), electron geometry - octahedral, molecule geometry - linear. Such a molecule (when two atoms of grey color) are the same, dipole moments will cancel. For a molecule to have a non zero dipole moment these two atoms should be different.

Hybridization - sp3d2 or d2sp3

(d)a molecule with five steric number of which three are bonded electrons and two is non bonded by

Steric number - 5, electron geometry - trigonal bipyramidal, molecule geometry - T-shaped. The dipole moments will not cancel as lone pairs push the bonding pairs away thus making the molecule nonsymmetrical.

Hybridization is - sp3d of dsp3