Which of the following is not an acid anhydride?

C O_{2}

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C O

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S O_{2}

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S O_{3}

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Solution

The correct option is B $C O$
An acid anhydride is a type of chemical compound derived by the removal of water molecules from an acid.

$H_{2} C O_{3} ⟶ C O_{2} + H_{2} O$

$H_{2} S O_{3} ⟶ S O_{2} + H_{2} O$

$H_{2} S O_{4} ⟶ H_{2} O + S O_{3}$

But, CO is not derived by the removal of water molecules from an acid.

Hence, option B is correct.

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