Molecular hydrides are classified as electron deficient, electron precise and electron rich compounds. Explain each type with two examples.

Molecular hydrides are classified as electron deficient, electron prec

1.	Molecular hydrides are classified as electron deficient, electron precise and electron rich compounds. Explain each type with two examples.
Answer» Solution :Molecular HYDRIDES are classified according to the relative numbers of ELECTRONS and BONDS, in their lewis structure as follow. (i) Electron deficient hydrides : In these hydrides there are less than eight electrons present arround the central atom. Group-13 elements make these type of hydrides. e.g., `BH_3, AIH_3`, etc. These hydrides are lewis acid in nature . (ii) Electron PRECISE hydrides : In this type of hydrides central atom have eight electrons. Group-14 elements, give these type of hydrides e.g. `CH_4, SiH_4` (iii) Electron rich hydrides : In these type of hydrides central atom have than 8 electron. Group - 15, 16 and 17 elements gave this type of hydrides. e.g., `NH_3 , H_2O , HF` , etc.