# NEET Chemistry The p-Block Elements (XII) Questions Solved

Give reasons for the following:

(i) Where R is an alkyl group, ${R}_{3}P=O$ exists but ${R}_{3}N=O$ does not.

(ii) $PbC{l}_{4}$ is more covalent than $PbC{l}_{2}.$

(iii) At room temperature, ${N}_{2}$ is much less reactive.