Question
Identify the which can exhibit tautomerism ?



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[Given : Molar mass of $A =93\, g\, mol ^{-1}$. Molal depression constant of water is $1.86\, K \,kg\, mol ^{-1}$ ]
${P_4}\xrightarrow{{{O_2}}}'X'$
${P_4}\xrightarrow{{{O_2}(excess)}}'Y'$