Identify simple acid anhydride from following.

Ethanoic butanoic anhydride

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Ethanoic anhydride

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Ethanoic methanoic anhydride

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None of these

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Solution

The correct option is C Ethanoic anhydride
Ethanoic anhydride $C H_{3} C O - O - O C - C H_{3}$ is simple acid anhydride.

Its common name is acetic anhydride. It is anhydrde of acetic acid $C H_{3} C O O H$ .

Ethanoic butanoic anhydride $C H_{3} C O - O - O C - C H_{2} C H_{2} C H_{3}$ and

Ethanoic methanoic anhydride $C H_{3} C O - O - O C - H$ are mixed acid anhydrides.

Option B is correct.

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