First slide

Anomalous properties of Boron

Question

Maximum $pπ - pπ$ back bonding exists in

Moderate

A

${BCl}_{3}$
B

${BI}_{3}$
C

${BBr}_{3}$
D

${BF}_{3}$

Solution

In ${BF}_{3}$ , boron atom has vacant $2 p_{z}$ A.O. and fluorine atom has electron pair in 2p A.O. So, maximum overlapping is possible between vacant $2 p_{z}$ 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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