1.

The most contributing tautomeric enol form of "MecCOCH"_(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_(3) - underset(O)underset(||)(C) - CH_(2) - underset(O) underset(||)(C) - `Oet

This ENOL form is stabilised due to resonance.


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