Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, is NH 3 ,   AlCl 3 ,   BeCl 2 ,   CCl 4 ,   PCl 5

Step-by-step solution

Among the given species NH 3 and CCl 4 is having eight electrons at the central atoms. In ammonia, one lone pair and three bond pairs at nitrogen. In carbon tetrachloride four bond pairs are present. In AlCl 3 , aluminium has three bond pairs, i.e., it has incomplete octet. In BeCl 2 , beryllium has two bond pairs, i.e., it has incomplete octet. In PCl 5 , phosphorus has five bond pairs, i.e, it has expanded octet.