Question

explain in brief why hydride bridge in (beh2)n is considered to be electron deficient but not the halide bridge in( becl2)n?​

Answer 1

BeH2, BH3 are electron deficient hydrides. (ii) Electron precise hydrides: Those compounds in which exact number of electrons are present in central atom or the central atom contains complete octet are called precise hydrides e.g., CH4, SiH4, GeH4 etc. are precise hydrides.