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B
Ethanoic anhydride
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C
Pentanoic anhydride
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D
Methanoic anhydride
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Solution
The correct option is B Ethanoic anhydride CH3CO−O−OC−CH3 is an acetic anhydride. It's IUPAC name is ethanoic anhydride. It is anhydride of ethanoic acid (acetic acid CH3CO−OH)