Arrange the following in the order of property indicated for each set :
(i) `F_2, Cl_2, Br_2I_(2)` - increasing bond dissociation enthalpy.
(ii) HF, HC1, HBr, HI - increasing acid strength.
(iii) `NH_3, PH_3, AsH_3, SbH_3, BiH_3` - increasing base strength.

Explanation

(i) Increasing bond dissociation `rArr I_(2) lt F_(2) lt Br_(2) lt Cl_(2)`
(ii) Increasing acid strength `rArr HF lt HCl lt HBr lt Hl`
(iii) Increasing base strength `rArr BiH_(3) lt SbH_(3) lt AsH_(3) lt PH_(3) lt NH_(3)`