What is the total number of carbon atoms present in the principal carbon chain of the IUPAC name for (using the 1993 recommendations for identical terminal groups)?

Question

What is the total number of carbon atoms present in the principal carbon chain of the IUPAC name for $HOOC-CH_2-CH(COOH)-CH_2-COOH$ (using the 1993 recommendations for $\ge3$ identical terminal groups)?

Prashant Kotian · Accepted Answer

Correct answer: 3. When three identical chain-terminating groups are attached to an unbranched chain, the carbons of the functional groups are excluded from the principal chain. The remaining unbranched chain connects the three groups directly, consisting of (3 carbons, propane). The name is Propane-1,2,3-tricarboxylic acid.

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