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The order of stability of the following ...

The order of stability of the following tautomeric compound is
`CH_(2) = oversetoverset(C ) - CH_(2) - oversetoverset(O)("||")C - CH_(3) hArr`
`CH_(3) - oversetoverset(O)("||")C-CH_(2) - oversetoverset(O)("||")C - CH_(3)hArr`
`CH_(3) - oversetoverset(OH)(|)C = CH - oversetoverset(O)("||")C - CH_(3)`

A

III `gt` II `gt` I

B

II `gt` I `gt` III

C

II `gt` III `gt` I

D

O `gt` II `gt` III

Text Solution

Verified by Experts

The correct Answer is:
A
`CH_(3) - oversetoverset(OH)(|)C = CH - oversetoverset(O)(|)C-CH_(3)`
This is more stable because of Intra molecular hydrogen bonding and conjugation of L.P and `pi` - electrons and between `pi`- electrons
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The order of stability of the following tautomeric compounds is (i). CH_(2)=overset(OH)overset(|)(CH)-CH_(2)-overset(O)overset(||)(C)-CH_(3)hArr (ii). CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)hArr (iii). CH_(3)-overset(OH)overset(|)(C)=CH-overset(O)overset(||)(C)-CH_(3)

The IUPAC name for CH_(3) - undersetunderset(O)("||")C-OH and CH_(3) - undersetunderset(O)("||")C-CH_(3)

IUPAC nomenclature of CH_(3) - undersetunderset(CH_(3))(|)oversetoverset(CH_(3))(|)C - CH = oversetoverset(CH_(3))(|)C - CH_(3) is

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