Predict the correct relationship between given compounds :
(I) CH₃-CO-CH₃ (II) CH₂=C(OH)-CH₃ (III) CH₃-CH₂-CHO (IV) CH₂=CH-O-CH₃

Question

Predict the correct relationship between given compounds : (I) CH 3 -CO-CH 3 (II) CH 2 =C(OH)-CH 3 (III) CH 3 -CH 2 -CHO (IV) CH 2 =CH-O-CH 3

TestHub · Accepted Answer

(I) is propan-2-one (a ketone) and (II) is prop-1-en-2-ol, its enol form : they interconvert by migration of a proton and are tautomers. (III) propanal is a functional-group isomer of (I) (aldehyde vs ketone), not a tautomer and not a metamer (metamerism needs the same functional group with different alkyl groups around a divalent atom). (IV) is methyl vinyl ether, an enol ether - it has no OH, so it is not a tautomer of propanal; it is a functional-group isomer.

Ans. (B)

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