Q 1 :    

Amongst the following, the total number of species not having eight electrons around central atom in its outermost shell, is          [2023]

${\text{NH}}_3,{\text{AlCl}}_3,{\text{BeCl}}_2,{\text{CCl}}_4,{\text{PCl}}_5$

• 4

   

• 1

   

• 3

   

• 2