It is a 6-carbon dicarboxylic acid:

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Multiple Choice

It is a 6-carbon dicarboxylic acid:

Explanation:
Recognizing how many carbon atoms are in a dicarboxylic acid helps you identify which one has a six-carbon backbone. Dicarboxylic acids are named as alkane diacids, with the number of carbons in the main chain matching the number in the name. Counting the carbons: succinic acid has four, glutaric acid has five, adipic acid has six, and pimelic acid has seven. The six-carbon option has two carboxyl groups at the ends of a hexane chain, HOOC-(CH2)4-COOH, which is adipic acid.

Recognizing how many carbon atoms are in a dicarboxylic acid helps you identify which one has a six-carbon backbone. Dicarboxylic acids are named as alkane diacids, with the number of carbons in the main chain matching the number in the name. Counting the carbons: succinic acid has four, glutaric acid has five, adipic acid has six, and pimelic acid has seven. The six-carbon option has two carboxyl groups at the ends of a hexane chain, HOOC-(CH2)4-COOH, which is adipic acid.

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