Which one of the following represents all isoelectronic species ?

Which one of the following statements is incorrect related to Molecular Orbital Theory?

Given below are two statements:

Statement I : Hydrated chlorides and bromides of $$\mathrm{Ca}, \mathrm{Sr}$$ and $$\mathrm{Ba}$$ on heating undergo hydrolysis.

Statement II : Hydrated chlorides and bromides of $$\mathrm{Be}$$ and $$\mathrm{Mg}$$ on heating undergo dehydration.

In the light of the above statements, choose the correct answer from the options given below :

Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, is

$$\mathrm{NH}_{3}, \mathrm{AlCl}_{3}, \mathrm{BeCl}_{2}, \mathrm{CCl}_{4}, \mathrm{PCl}_{5}$$ :