Q.

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

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a

large electronegativity of F

b

pπ-pπ back bonding

c

pπ-dπ back bonding

d

three centred two electron bonds in BF3

answer is B.

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Detailed Solution

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