The general structure of a carboxylic acid is B.
What is a carboxylic acid?
An organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid.
A carboxylic acid's general formula is R-COOH, where COOH denotes the carboxyl group and R denotes the remainder of the molecule to which this group is linked.
There is carbon in this carboxyl group that has a double connection with an oxygen atom and a single bond with a hydroxyl group.
Hence, option B is correct.
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