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Tautomerism

Among the giv...

Question

Among the given compounds, the correct order of enol content is:

A

I > I I > I I I

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B

I I I > I I > I

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C

I I > I > I I I

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D

I I > I I I > I

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Solution

The correct option is A $I > I I > I I I$
The enol forms of the given compounds are :

As we can see that compound $I$ enol form, is the most stable due to aromaticity and hydrogen bonding.
Compound $I I$ enol form is also stabilized by aromaticity, but here no hydrogen bonding is observed.
Compound $I I I$ enol form is the least stable since there is no stabilising factor like aromaticity.
So, the correct order is :
$I > I I > I I I$

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