Hybridisation

S(excited state)=
It has two bonds and one lone pair The ) double bond arise from bonding due to lateral overlap of p-orbitals of oxygen with orbitals of sulphur. The bond between S and O results from hybridization in S-atom.

The molecules having distorted geometry have dipole moment and those having regular geometry have zero dipole moment. have distorted geometry. They have dipole moment. has regular triangular planar geometry and thus, the dipole moment of is zero.

Due to this type of hybridisation geometry of the molecule is trigonal bipyramidal and the hybrid orbitals used by As-atom ares, and