The main factor responsible for weak acidic nature of B-F bonds in BF3 is -

Large electronegativity of F

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Three centred two electron bonds in BF3

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pp- dp back bonding

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pp- pp back bonding

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Solution

The correct option is D
pp- pp back bonding

It is pp- pp bonding involving B and F atom responsible for the acidic nature of boron halides as BF3<BCl3<BBr3< BI3 smaller atom shows more back bonding

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B - F

B F_{3}

B - F

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B F_{3}

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