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Question

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

A
HC=¨O:HCO:
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B
CH2N¨NCH2=N=N
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C
CH3CHOHCH3CH=OH
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D
H2(+)CC()HCH=CH2H2+CCH=CHCH()2
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Solution

The correct option is A HC=¨O:HCO:
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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