$P$ and $Q$ are isomers of dicarboxylic acid $\mathrm{C}_4 \mathrm{H}_4 \mathrm{O}_4$. Both decolori

Question

$P$ and $Q$ are isomers of dicarboxylic acid $\mathrm{C}_4 \mathrm{H}_4 \mathrm{O}_4$. Both decolorize $\mathrm{Br}_2 / \mathrm{H}_2 \mathrm{O}$. On heating, $P$ forms the cyclic anhydride. Upon treatment with dilute alkaline $\mathrm{KMnO}_4, P$ as well as $Q$ could produce one or more than one from $S, T$ and $U$.

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