p Block Elements

Concept:Identifying the compounds X, Y and Z from the given reaction scheme and checking the truth of each statement.Explanation:Compound X is chlorine ($\mathrm{Cl}_2$).It is used as a disinfectant to sterilize drinking water. Hence statement A is correct.Compound Y is nitrogen trichloride ($\mathrm{NCl}_3$).Its shape is pyramidal (not planar) because nitrogen has one lone pair of electrons. Hence statement B is incorrect.Compound Z is chlorine trifluoride ($\mathrm{ClF}_3$).It is a strong fluorinating agent and converts uranium to $\mathrm{UF}_6$, which is used in the enrichment of $^{235}\mathrm{U}$. Hence statement C is correct.In $\mathrm{NCl}_3$, the electronegative chlorine atoms withdraw electron density from nitrogen, making its lone pair less available for donation.Thus $\mathrm{NH}_3$ is a stronger Lewis base than $\mathrm{NCl}_3$. Hence statement D is incorrect.Answer:Statements A and C are correct.