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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Dinesh khalmaniya 1 Best Answer
option A First of all we will check total covalent bonds in all resonating structures. A and B has same and less covalent bonds then C and D. so less stable. if we talk about least stable resonating structures then we have to compare structure A and B. A have carbanion near to the O so lone pair on O repails these Carbanion makes it least stable