Question

which of the following is called as el
ectron deficient molecule ?
1) BF3
2)CH4
3) H2O
4)NH3​

Answer 1

$\huge\underline\blue{\sf Answer}$

➡BF3 Is the Electron Deficient Molecule.

➡Option .1)

❇As the valency of Boron 3 it combines with 3 Flourines to form only 6.

❇ 8 are needed for octet so it is electron deficient .

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Answer 2

$BF_3$ is called as electron deficient molecule.

Explanation:

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

As $BF_3$ is a covalent compound which contains 6 electron pairs and thus is short of two electrons to complete its octet, thus it can easily accept an electron pair from a lewis base.

$CH_4$ has octet of electrons around carbon. $H_2O$ has octet of electrons around oxygen and $NH_3$ has excess of electrons around nitrogen, thus is electron rich.

Learn more about lewis acid or lewis base

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