Which of the following names are correct for the compound? HOOC-CH_2-CH_2-CH(COOH)-CH_2-CH_2-COOH

JEE Advanced Chemistry question

Which of the following names are correct for the compound?

HOOC---CH(COOH)---COOH

(A)Heptane-1,4,7-trioic acid
(B)4-carboxy heptane-1,7-dioic acidCorrect
(C)Pentan-1,3,5-tricarboxylic acidCorrect
(D)All of the above

Answer: (B),(C)

Solution

The molecule has three groups: two at the ends of a 7-carbon chain and one branching off the middle (C4) carbon. Since the C4 carboxyl carbon is not itself part of the continuous carbon chain, it cannot be numbered as "position 4" of a "trioic acid" suffix spanning the chain — so (a) is grammatically invalid.

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Question ID VK-159233