The correct statements among a to d are: a Saline hydrides produce H 2 gas when reacted with H 2 O . b Reaction of L i A l H 4 with B F 3 leads to B 2 H 6 . c P H 3 and C H 4 are electron - rich and electron - precise hydrides, respectively. d H F and C H 4 are called as molecular hydrides.

Step-by-step solution

(1) Saline hydrides are ionic hydrides such as L i H ,   N a H . When reacting with water to form a Base and hydrogen gas. MH s + H 2 O aq   ⟶ MOH aq + H 2 (2) B F 3 when reacts with L i A l H 4 produces B 2 H 6 (3) (4) Molecular hydrides are also called covalent hydrides. HF and C H 4 are covalent or molecular hydrides. Hence, all statements are correct.