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Subject - Inorganic Chemistry

In inorganic chemistry, acid anhydrides are non-metal oxides that form acidic aqueous solutions.

Subject - Organic Chemistry

In organic chemistry, acid anhydrides are the dehydration products derived from two organic acids or an organic and inorganic acid containing the functional group -CO-O-CO-. Symmetrical and mixed anhydrides exist. Formally, they are formed by removal of water from organic acids (-COOH). Dicarboxylic acid, such as maleic acid or succinic acid can form cyclic anhydrides.

Fig.1
Formal generation of anhydrides

See also: dehydration