In BF_3 molecule: | vedclass

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Question

(B) In $BF_3$,the boron atom is electron-deficient and has an incomplete octet. To achieve stability,one of the lone pairs from the fluorine atom is d

Vedclass · Accepted Answer

the boron-fluorine bond has some double bond character and this bond is delocalized.

Vedclass · Answer

(B) In $BF_3$,the boron atom is electron-deficient and has an incomplete octet. To achieve stability,one of the lone pairs from the fluorine atom is donated into the empty $2p$ orbital of the boron atom. This phenomenon is known as $p\pi-p\pi$ back bonding. As a result,the $B-F$ bond acquires partial double bond character,and this electron density is delocalized across the three $B-F$ bonds.

In $BF_3$ molecule:

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