Define the following terms: (a) electron - deficient (b) electron - precise (c) electron rich compound. Justify your answer with an example.

Electron deficient: The compounds which do not have a sufficient number of electrons to form a covalent bond are called electron deficient. These types of compounds are usually formed by group 13 elements. The central atom cannot fulfill the octet rule. Example BH3 and AlH3. These compounds generally exist in polymeric forms like B2H6, B4H10,  and (AlH)n.

Electron precise: The type of hydrides that have the exact number of electrons to form a covalent bond are called electron precise. These types of compounds are usually formed by group 14 elements. The compounds usually have a tetrahedral shape. Example CH4, SiH4, etc.

Electron rich: The type of hydrides which have more number of electrons than required for bonding are called electron-rich hydrides. The excess number of electrons are mainly the lone pair of electrons on the central atom. These types of compounds are usually formed by groups 15, 16 and 17 elements. Example NH3, PH3, etc.

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