Q.

Maximum pπ-pπ back bonding exists in

Moderate

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BCl3

BI3

BBr3

BF3

answer is 4.

(Detailed Solution Below)

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Detailed Solution

In BF3, boron atom has vacant 2pz A.O. and fluorine atom has electron pair in 2p A.O. So, maximum overlapping is possible between vacant 2pz A.O. of boron and fully filled 2p A.O. of fluorine due to similar size of A.O. of boron and fully filled 2p A.O. of fluorine due to similar size of AO's.

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