In which of the following pairs of resonance contributors in the structure on the left an important contributor?
A
H−⊕C=¨O:⟷H−C≡⊕O:
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B
⊝CH2−⊕N≡¨N⟷CH2=⊕N=⊝N
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C
CH3−⊕CH−OH⟷CH3−CH=⊕OH
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D
H2(+)C−C(−)H−CH=CH2⟷H2+C−CH=CH−CH(−)2
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Solution
The correct option is AH−⊕C=¨O:⟷H−C≡⊕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