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Toutomerism is not exhibited by

Essential condition for tatomeriam is the presence of an $\alpha$ hydrogen on a saturated carbon attached to $C=O,NO,NO_2$ etc.
or should have a H- atom present on a heteroatom (o,N,S etc) attached to a double bond.
Thus, option (a) does not have $\alpha$ hydeogen on a saturated carbon and hence does not exhibit tatutomerism.
Hence a is the correct answer.