Which of the following are wrong ?

(a) SH6  and  BiCl5 do not exist. In SH6, EN of H-atom is not sufficient to excite e−  s from 3p orbital to 3d orbitals from S-atom. In BiCl5,  Bi3+ is more stable than Bi5+ due to inert pair effect.(b) pπ−dπ  bond=1,  pπ−dπ  bond=2(c) Wrong. Hybridization of : SeF4 ⇒12 6+4=5=sp3dGeometry = due to one lone-pair of e−  s its shape is see-saw.Hybridization of CH4⇒ sp3 and tetrahedral.(d) Correct. Hybridization of I3Θ  H2Θ ⇒  12  7+2+1=5  =sp3dDue to three lone-pair of e−s, it is linear.