JEE Main · 2022 · 26 Jun 2022 · Shift 1 · Aldehydes Ketones and Carboxylic Acids

Among the following structures, which will show the most stable enamine formation?
(Where Me is

- CH_{3}

)

(A)(see structure)
(B)(see structure)
(C)(see structure)
✓ Correct
(D)(see structure)

Answer: (C)

Solution

All four enamines shown are resonance structures of the same system and are interconvertible. The most stable form is option (C) due to steric factors. In (C), the double bond geometry and the position of the methoxy group minimize steric interactions between substituents, making it the most stable conformer among the resonance forms.

JEE Main · 2022 · 26 Jun 2022 · Shift 1 · Single correct option

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