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Question

Which of the following is a tautomer of

CH3−C||O−H?


A

CH3C||OCH3

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B

CH2=CH|OH

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C

CH3CH2CHO

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D

CH3COOH

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Solution

The correct option is B

CH2=CH|OH


It is a phenomenon in which a single compound exists in two readily interconvertible structures that differ in the relative position of atleast one atomic nucleus, generally hydrogen.

Tautomeric structures are obtained by the simultaneous shift of H atom and double bond at1 and 3 position.That is why it is also called 1,3-shift. It is further called desmotropism or dynamic isomerism or kryptomerism.

O||CH|C|(Keto)OH|C=C|(Enol)

One of the major conditions for tautomerism is the presence of an α-hydrogen

α-hydrogen is present on α- carbon

Here,

HH|C|HC||OHCH2=CH|OH


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