Question

Arrange the following in the order of property indicated for each set:
(i). `F_2,Cl_2,Br_2I_2-` increasing bond dissociation enthaply.
(ii). `HF,HCl,HBr,HI`- increasing acid strength.
(iii). `NH_3,PH_3,AsH_3,SbH_3,BiH_3-` increasing base strength.

Answer 1

(i) `I_(2) (151.1 " kJ mol"^(-1)) lt F_(2) (158.8 " kJ mol"^(-1)) lt Br_(2) (192.8 " kJ mol"^(-1)) lt Cl_(2) (242.6 " kJ mol"^(-1))`
(ii)` HF lt HCl lt HBr lt HI`
(iii) `BiH_(3) lt SbH_(3) lt AsH_(3) lt PH_(3) lt NH_(3)`.