(a) Draw the three isomers of benzenedicarboxylic acid.(b) The isomers have melting points of 210 °C, 343 °C, and 427 °C. Nitration of the isomers at all possible positions wasonce used to determine their structures. The isomer that melts at 210 °C gives two mononitro isomers. The isomerthat melts at 343 °C gives three mononitro isomers. The isomer that melts at 427 °C gives only one mononitro isomer.Show which isomer has which melting point.

Question

(a) Draw the three isomers of benzenedicarboxylic acid.
(b) The isomers have melting points of 210 °C, 343 °C, and 427 °C. Nitration of the isomers at all possible positions was
once used to determine their structures. The isomer that melts at 210 °C gives two mononitro isomers. The isomer
that melts at 343 °C gives three mononitro isomers. The isomer that melts at 427 °C gives only one mononitro isomer.
Show which isomer has which melting point.

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