Arrange the following groups of substances in the order of the property indicated against each grou

Arrange the following groups of substances in the order of the property indicated against each group: (i) `NH_(3)PH_(3)AsH_(3)SbH_(3)` increasing order of boiling points (ii)O,S,Se,To increasing order of electron gain enthalphy with negative sign (iii) `F_(2),CI_(2),Br_(2),I_(2)` increasing order of bond dissociation enthalphy

against