Boron fluoride exists as BF 3 but boron hydride doesn’t exist as BH 3 . Give reason. In which form does it exist? Explain its structure

Question

Philoid · Accepted Answer

pπ−pπ back bonding occurs in BF₃.Boron has vacant 2p orbital and fluorine has completely filled 2p orbital so fluorine transfer 2p electron to boron. Now Boron’s deficiency has been filled making BF₃ stable.

In BH₃ hydrogen has lone pair and cannot fulfil the deficiency of boron so dimerise to form B₂H₆ which is in the shape of a banana and also known as a banana bond.

Boron fluoride exists as BF3 but boron hydride doesn’t exist as BH3. Give reason. In which form does it exist? Explain its structure

Boron fluoride exists as BF₃ but boron hydride doesn’t exist as BH₃. Give reason. In which form does it exist? Explain its structure