Number of hypervalent species among the following $C l O_{4}^{-}, B F_{3}, S O_{4}^{2 -}, C O_{3}^{2 -}$

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Solution

A hypervalent molecule (expanded octet) is a molecule that contains one or more main group elements formally bearing more than eight electrons in their valence shells. So $C l O_{4}^{-}$ is hypervalent as $C l$ contains more than $8$ electron and $S O_{4}^{2 -}$ is hypervalent as $S$ contains more than $8$ electrons. In $B F_{3}$ , boron contains only $6$ valence electrons in its outer shell. In $C O_{3}^{2 -}$ , $C$ atom contains $8$ electrons in its valence shell.

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Number of hypervalent species among the following ClO−4,BF3,SO2−4,CO2−3

1 : C l O_{4}^{-}

2 : B F_{3}

3 : S O_{4}^{2 -}

4 : C O_{3}^{2 -}

1. C l O_{4}^{-}, 2. B F_{3}, 3. S O_{4}^{2 -}, 4. C O_{3}^{2 -}

C l O_{4}^{-}

B F_{3}

S O_{4}^{2 -}

C O_{3}^{2 -}

B F_{3}, S F_{4}, N C l_{3}, P C l_{5}, S i F_{4}, B r F_{5}, X e F_{2}, B e C l_{2}

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