Among the following,the least stable resonanc | vedclass

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(A) The stability of resonance structures is determined by several factors,including the number of covalent bonds,the presence of complete octets,and

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(A) The stability of resonance structures is determined by several factors,including the number of covalent bonds,the presence of complete octets,and the separation of formal charges. According to the rules of resonance,structures with like charges on adjacent atoms are highly unstable due to strong electrostatic repulsion. In structure $A$,a positive charge is placed on the carbon atom adjacent to the nitrogen atom,which already bears a formal positive charge. This proximity of two positive charges makes the structure highly unstable compared to others where charges are separated by greater distances or are opposite in nature.

Among the following,the least stable resonance structure is

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