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Which of the following is a tautomer of propanone?

Apropanal
Bprop-2-en-1-ol
Cprop-1-en-2-ol
Doxetane

Answer: C

A tautomer is formed by a proton shift with the double bond moving. Propanone,

CH X_{3} COCH X_{3}

, shifts an alpha hydrogen to oxygen to give

CH X_{2} = C (OH) CH X_{3}

, prop-1-en-2-ol. Propanal, prop-2-en-1-ol and oxetane are isomers but not tautomers.

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