Which of the following species are hypervalent?
$1$ . $C l O_{4}^{-}$
$2$ . $B F_{3}$
$3$ . $S O_{4}^{2 -}$
$4$ . $C O_{3}^{2 -}$

1, 2, 3

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1, 3

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3, 4

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1, 2

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Solution

The correct option is B $1, 3$

A hypervalent molecule is that molecule that contains one or more main group elements which contain more than eight electrons in their valence shells. So $C l O_{4}^{-}$ is hypervalent as Cl contains 14 electrons and $S O_{4}^{2 -}$ is hypervalent as S contains 12 electrons.
$B F_{3}$ and $C O_{3}^{- 2}$ are not hypervalent they have 6 and 8 electrons in their valence shells.
Hence option B is correct.

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Similar questions

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

2 : B F_{3}

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

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

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 -}

C l O_{4}^{-}

B F_{3}

S O_{4}^{2 -}

C O_{3}^{2 -}

C O_{3}^{2 -}, A s O_{3}^{3 -}, X e O_{3}, C l O_{3}^{-}, B O_{3}^{3 -},

S O_{3}^{2 -}

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