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

How does electron deficient compound BF_(3)achieveelectronic saturatio

1.	How does electron deficient compound BF_(3)achieveelectronic saturation i.e., fully occupied outer electron shells ?
Answer» SOLUTION :By thefollowing two WAYS (i) Multiple bonding of `ppi-ppi`back bonding , e.g.,`BF_(3)`in which a lone pairof electrons present in `2p-`orbital of one of the fluorine atoms may betransferred to the vacantp-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,behavesas Lewis acids.