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# Which of the following does not show tautomerism ?

$(a)\;C_6H_5COCH_3 \\(b)\;CH_3CHO \\(c)\;CH_3COCH_3 \\(d)\;C_6H_5COC(CH_3)_3$

For an aldehyde or a ketone to exhibit tautomerism it is essential that it must have at least one $\alpha-H$ atom.
So, $C_6H_5COC(CH_3)_3$