Identify the compound that exhibits tautomerism:

2-Butene

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Lactic acid

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2-Pentanone

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Phenol

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Solution

The correct option is C 2-Pentanone
$H_{3} C - O | | C - C H_{2} - C H_{2} - C H_{3} T a u t o m e r i s m ⇌ H_{3} C - O - H | C = C H - C H_{2} - C H_{3}$
Keto form enol form

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Identify the compound that exhibits tautomerism?

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