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Explain why BF3 exists whereas BH3 …

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Explain why BF3 exists whereas BH3 does not?

Posted by Pranav Choubey 4 years, 7 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 7 months ago

Bh3 molecule is an electron deficient molecule in nature since the 6 electrons are around the 'B' atom. Hydrogen being small in size, plus electron deficient it cannot donate electrons to boron, hence to exist, Bh3 goes under dimerization so as to fulfill the electron deficiency and attain stability.

Hydrogen being small in size dimerization is possible.

Bf3 is also deficient but because of larger size of 'F' atom, it cannot undergo dimerization, so it exists as Bf3 with a partial negative charge in boron and partial positive charge on fluorine.

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