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Consider the following reaction: The m-isomer of D and E is called:

1. Phthalic acid
2. Isophthalic acid
3. Terephthalic acid
4. None

Correct answer: Isophthalic acid

Solution

In aromatic dicarboxylic acids, the meta (m-) isomer is named isophthalic acid. The ortho and para isomers are phthalic acid and terephthalic acid, respectively.

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