1.

The most contributing tautomeric enol form of MeCOCH_(2)CO_(2)Et is

Answer»

`CH_(2)=C (OH)CH_(2)CO_(2)Et`
`MeC(OH)=CHCO_(2)Et`
`MeCOCH=C(OH)Oet`
`CH_(2)=C(OH)CH=C(OH)Et`

SOLUTION :`CH_(2)-UNDERSET(O)underset(||)(C )-CH_(2)-underset(O)underset(||)(C )-Oet OVERSET(-H^(+))underset(+ H^(+))hArr`

This enol form is stabilized due to resonance.


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