Which one of the following is not hypovalent molecules / species?

A l F_{3}

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A l C l_{3}

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{H C O_{3}}^{-}

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B e C l_{2}

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Solution

The correct options are
C $A l F_{3}$
D ${H C O_{3}}^{-}$

Those species which have the central atom with less than eight electrons in the outermost shell or valence shell are considered as hypovalent species.

$A l F_{3} \to A l^{3 +} + 3 F^{-},$ it is ionic. Therefore, $A l^{3 +}$ and $3 F^{-}$ are not hypovalent.

$A l C l_{3} \to c o v a l e n t$ . Therefore, hypovalent since it has only 6 electrons in the valence shell of Al.

$H C O_{3}^{-}$ has 8 electrons in the central C - atom so not hypovalent.

$B e C l_{2}$ has 4 electrons in the central Be- atom so hypovalent.

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