The number of correct options is
(a) `1^(Theta) gt Br^(Theta) gt CI^(Theta) gt F^(Theta)` (polarisability)
(b) `Li^(o+) gt Na^(o+) gt K^(o+) gt Rb^(o+)` (polarisation power)
(c ) `H_(2)Ogt H_(2)S gtH_(2)Se gtH_(2)` Te (order of b.pt)
(d) `H_(2)^(Theta) lt H_(2)^(o+)` (order of stability) .

Answer

3

Explanation

(a),(b) and (d) correct options
(a) `I^(Theta) gt Br^(Theta) gt CI^(Theta) gtF^(Theta)` (Polarisability)
According to Fajans' rule small cation is more polarisable
(c ) Wrong and
Boiling point order is
Both `H_(2)^(Theta)` have same bond order of 0.5 `H_(2)^(o+)` is more stable than `H_(2)^(Theta)`, since `H_(2)^(o+)` contains one `e^(-)` in antibonding orbitals .