The p-Block Elements — Chemistry STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe p-Block Elements2 Marks
Question
How does electron deficient compound $\mathrm{BF}_3$ achieve electronic saturation, i.e. fully occupied outer electron shells?
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Answer
$\mathrm{BF}_3$ achieve it by the following ways.
i. Multiple bonding or $p \pi-p \pi$ back bonding, e.g. $\mathrm{BF}_3$ in which a lone pair of electrons present in 2 p -orbital of one of the fluorine atoms may be transferred to the vacant p-orbital on the boron atom.
ii. Formation of complexes in which electrons are received from a donor molecule, e.g. $\mathrm{F}_3 \mathrm{B} \leftarrow \mathrm{NH}_3$. Boron compounds, thus, behave as Lewis acids.
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