How does electron deficient compound `BF_(3)` achieve electronic saturation i.e., fully occupied outer electron shells ?

How does electron deficient compound `BF_(3)` achieve electronic satur

1.	How does electron deficient compound `BF_(3)` achieve electronic saturation i.e., fully occupied outer electron shells ?
Answer» By the following two ways (i) Multiple bonding of `ppi-ppi` back bonding , e.g., `BF_(3)` in which a lone pair of electrons present in `2p-`orbital of one of the fluorine atoms may be transferred to the vacant p-orbital one the boron atom. (ii) Formation of complexes in which electronsare received from a donor molecule e.g., `F_(3)Brarr NH_(3)`. Boron compounds, thus, behaves as Lewis acids.

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How does electron deficient compound `BF_(3)` achieve electronic saturation i.e., fully occupied outer electron shells ?

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