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Question

From the following pπdπ back bonding cannot occur in:

A
BF3
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B
AsF3
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C
PF3
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D
O(SiH3)2
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Solution

The correct option is A BF3
For pπ−dπ back bonding, one atom must have a lone pair in its p-orbital and the other must have vacant d-orbitals.

a) In O(SiH3)2, oxygen has a lone pair in its p-orbital and Si has vacant d-orbitals. So, O(SiH3)2 has pπdπ back bonding.

b) In PF3, fluorine has a lone pair in its p-orbital and P has vacant d-orbitals. So, PF3 has pπdπ back bonding.

c) In AsF3, fluorine has a lone pair in its p-orbital and As has vacant 4d-orbitals. So, AsF3 has very poor pπdπ back bonding.

d) In BF3, fluorine has a lone pair in its p-orbital and Boron has vacant p-orbitals. So, BF3 has pπpπ back bonding and not pπdπ back bonding.

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