JEE Main Chemistry question

One of the stable resonating forms of methyl vinyl ketone (CH₂=CH–CO–CH₃) places

(A)a positive charge on the terminal CH₂ carbon, with the π bond shifted to C2–C3 and the negative charge/extra lone pair on oxygenCorrect
(B)a positive charge on oxygen with no change in the carbon skeleton
(C)a negative charge on the terminal CH₂ carbon with the carbonyl unchanged
(D)no charge separation at all

Answer: (A)

Solution

Conjugation in the enone allows the C1=C2 π electrons to shift toward the electronegative oxygen: CH₂=CH–CO–CH₃ ↔

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Question ID VK-139373