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Which of the following does not show tautomerism ?

$ (a)\;C_6H_5COCH_3 \\(b)\;CH_3CHO \\(c)\;CH_3COCH_3 \\(d)\;C_6H_5COC(CH_3)_3 $
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For an aldehyde or a ketone to exhibit tautomerism it is essential that it must have at least one $\alpha-H$ atom.
So, $C_6H_5COC(CH_3)_3 $
Hence d is the correct answer.
answered Mar 4, 2014 by meena.p

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