(a) Draw the structures of the following :
(i) `XeF_(4)`
(ii) `H_(2)S_(2)O_(7)`
(iii) `SO_(3)^(2-)`
(b) Explain the following observations :
(i) Phosphorous has a greater tendency for catenation than nitrogen.
(ii) The negative value of electron gain enthalpy is less for fluorine than that for chlorine.
(iii) Hydrogen fluoride has a much higher boiling point than hydrogen chloride.

Explanation

hydrogen bonding