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Question
Identify a more favourable resonance structure from the following. Justify.
\[\begin{array}{cc}
\phantom{.............}\ce{O-}\phantom{......................}\ce{O+}\\\phantom{............}|\phantom{.........................}|\\
\ce{^{+}CH3 - CH = C - H ↔ ^{-}CH2 - CH = C - H}
\end{array}\]
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Solution
\[\begin{array}{cc}
\phantom{.............}\ce{O-}\phantom{......................}\ce{O+}\\\phantom{............}|\phantom{.........................}|\\
\ce{^{+}CH3 - CH = C - H ↔ ^{-}CH2 - CH = C - H}
\end{array}\]
(I) (II)
Both structures (I) and (II) involves the separation of opposite charges, but structure (I) has a positive charge on the more electropositive ‘C’ and a negative charge on more electronegative ‘O’. Thus, structure (I) will be a more favourable resonance structure.
