Question

Boron flouride exists as bf3 but boron hydride does not exist as bh3

Answer 1

hey there

Due to absence of lone pair of electrons on H, the back bonding does not occur in BH3. In other words, electron deficiency of boron remains and BH3 does not exist. To reduce electron deficiency BH3 dimerises to form B2H6. Hence, boron hydride exists in dimeric form and known as diborane

hope it help

{MARK BRAINLIEST}