In which of the following pairs of resonance contributors in the structure on the left an important contributor?

H - \oplus C = ¨ O : ⟷ H - C \equiv \oplus O :

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⊝ C H_{2} - \oplus N \equiv ¨ N ⟷ C H_{2} = \oplus N = ⊝ N

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C H_{3} - \oplus C H - O H ⟷ C H_{3} - C H = \oplus O H

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H_{2} (+) C - C (-) H - C H = C H_{2} ⟷ H_{2} + C - C H = C H - C H_{2}^{(-)}

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Solution

The correct option is A $H - \oplus C = ¨ O : ⟷ H - C \equiv \oplus O :$
A resonance structure in which positive charge s present on less electronegative atom is more stable and hence an important contributor. This condition is satisfied by A since the Carbon atom which is less electronegative than oxygen carries a positive charge, hence it is the correct answer

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