Among the following statements:-
I.  ${\mathrm{PCl}}_5$ is trigonal bipyramidal whereas ${\mathrm{IF}}_5$ is square pyramidal.
II. Bond enthalpy of $\mathrm{O}-\mathrm{H}$ bond in water and ethanol is different.
III. All carbon atoms have same hybridisation in carbon suboxide $\left({\mathrm{C}}_3{\mathrm{O}}_2\right)$.
Find out the correct statements.