Explain why `PCl_(5)` is trigonal bipyramidal whereas `IF_(5)` is square pyramidal ?

Among the following statements:- I. PCl_(5) is trigonal bipyramidal wheras IF_(5) is square pyramidal. II. Bond enthalpy of O-H bond in water and ethanol is different. III. All carbon atoms have same hybridisation in carbon suboxide (C_(3)O_(2)) Find out the correct statements.

When PCl_(5) is heated

PCl_3 has the shape of a trigonal pyramid, whereas IF_5 has the shape of a suquare pyramid. Account for this difference.

Sn+PCl_(5) to

Complex [ML_(5)] can exhibit trigonal bipyramidal and square pyramidal geometry. Determine total number of 180^@, 90^@ & 120^@ L-M-L bond angles.

The shape of SF_(6) molecule is octahedral whereas that of IF_(7) is square pyramidal.

Match list and list II and pick out correct matching from the given choices. {:("List I (Compound)", "List II (Structure)"), ((a) ClF_3,"1. Square planar"),((b) PCl_5,"2. tetrahedral "),(( c) IF_5,"3. trigonal bipyramidal"),((d) C Cl_4,"4.square bipyramidal "),((e) XeF_4,"5. T-shaped"):}