P and Q are isomers of dicarboxylic acid `C_(4)H_(4)O_(4)`. Both decolorize `Br_(2)//H_(2)O`. On heating, P forms the cyclic anhydride.
Upon treatment with dilute alkaline `KMnO_(4)`, P as well as Q could produce one or more than one from S, T and U.
In the following reaction sequences V and W are respectively
A.
B.
C.
D.
