Answer:

Molecular hydrides are classed as electron-deficient, electron-rich, or precise. B2H6 is an oxyhydroxide. They lack an octet. Generally, group 13 elements like B, Al, etc. create them.

This hydride has the exact number of electrons required to make regular covalent bonds, with no excess or deficiency. These are created by group 14 elements with 4 valence electrons like Si and C. e.g. CH4, SiH4.