Question

In cationic part of PBr5 (solid), maximum planes that contain only three Bromine atoms are :-

Answer 1

In solid state PBr5 exist as [PBr4]+Br-. Anion part is Bromide ion. "Hybridisation of central atom in [PBr4]+ is sp3. The valence electronic configuration of P is 3s23p3. Since Phosphorous in [PBr4]+ has one electron less due to positive charge. So, its outer electronic configuration is 3s2 3p2. Phosphorous will excite in to 3s13p3​. It has four valence electrons which are bonded with four bromide ions. So, the hybridisation of central atom in cation part is sp3.
There fore maximum plane =0