Keto-enol tautomerism is not observed in

  • A
    $C_6H_5COC_6H_5$
  • B
    $C_6H_5COCH=CH_2$
  • C
    $C_6H_5COCH_2COCH_3$
  • D
    $CH_3COCH_2COCH_3$

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$(e)$ Metamerism
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