MCQ
Identify the compound that exhibits tautomerism :
- A$2-$ Butene
- BLactic acid
- ✓$2-$ Pentanone
- DPhenol

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[Given : $R_{\mathrm{H}}\left(\right.$ Rydberg constant) $=2.18 \times 10^{-18} \mathrm{~J}$.
$h($ Plank's constant $)=6.6 \times 10^{-34}$ J.s. $]$