Which of the following species does /do not exist?

O F_{4}

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N H_{2}^{-}

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N C l_{5}

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I C I_{3}^{2 -}

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Solution

The correct option is A $O F_{4}$
$O F_{4}$ does not exist. Oxygen is a second period element. This places restrictions on its bonding, because it can only use the s and p orbitals from the second shell in bonding. These orbitals can only hold 8 electrons. Since oxygen already has 6, covalent bonding with 2 fluorine atoms will give it 8.
Hence, option A is correct.

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