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Question
Which of the following will show tautomerism?
Which of the following will show tautomerism?
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Solution
The correct option is A
Carbonyl compound in which delocalisation takes place between a >C=O group and an alpha H where the equilibrium lies between a keto form and an enol form is called Keto-enol tautomerism.
In compound (c), there is no α−Hydrogen so it does not shows tautomerism.
In compounds (b) and (d), α−Hydrogen is attached to sp2 hybridised carbon so it won't involve in delocalisation with >C=O group. Hence, it does not exhibit tautomerism.
Only compound (a) shows Keto-enol tautomerism due to the presence of α−Hydrogen
Carbonyl compound in which delocalisation takes place between a >C=O group and an alpha H where the equilibrium lies between a keto form and an enol form is called Keto-enol tautomerism.
In compound (c), there is no α−Hydrogen so it does not shows tautomerism.
In compounds (b) and (d), α−Hydrogen is attached to sp2 hybridised carbon so it won't involve in delocalisation with >C=O group. Hence, it does not exhibit tautomerism.
Only compound (a) shows Keto-enol tautomerism due to the presence of α−Hydrogen
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