JEE Advanced 2013 Paper 2

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Paragraph for Questions 31 and 32

P and Q are isomers of dicarboxylic acid C4H4O4.Both decolorize Br2 / H2O. On heating, P forms the cyclic anhydride.
Upon treatment with dilute alkaline KMnO4, P as well as Q could produce one or more than one from S,T and U.
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Question : 31
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