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Question

The most contributing tautomeric enol form of MeCOCH2CO2Et is?


A

H2C=C(OH)CH2CO2Et

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B

MeC(OH) = CHCO2Et

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C

2-Pentanone

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D

2-Butene

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Solution

The correct option is B

MeC(OH) = CHCO2Et


Let's take a look at the structure:

MeO||CCH2C||OOEt

CH3O||CCH2C||OOEt [Here we have two α-hydrogens from different carbons]

But here,

Because it will form hydrogen bonding and make five membered ring.


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