MEDIUMMCQ SINGLENEET ChemistryInorganic Chemistryp-Block (group 13 and 14)Boron and Its Compounds
The main factor responsible for weak acidic nature of B—F bonds in BF₃ is:
A.high electronegativity of F
B.three centred two electron bonds in BF₃
C.pp—dp back bonding
D.pp—pp back bonding✓ Correct
Explanation
In Boron trifluoride ( 3 BF ), boron accepts lone pair of electrons of fluorine and get bonded to vacant p orbital and this bonding is known as pp—pp back bonding. Hence, the acidic character of this lewis acid 3 BF decreases due to back bonding.
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