Arrange the following (i) `CaH_(2), BeH_(2) and TiH_(2)` in order of increasing electrical conductance.
(ii) LiH, NaH and CsH in order of increasing ionic character.
(iii) H–H, D–D and F–F in order of increasing bond dissociation enthalpy.
(iv) `NaH, MgH_(2) and H_(2)O` in order of increasing reducing property.

Explanation

`(i) BeH_2 lt CaH_2 lt TiH_2`
(ii) `LiH lt NaH lt CsH`
(iii) `F-F lt H-H lt D-D`
(iv) `H_2 O lt MgH_2 lt NaH`