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(A) The stability of resonating structures is determined by the following rules:$1$. Neutral structures are more stable than charged structures.$2$. S

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$i > ii > iii$

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(A) The stability of resonating structures is determined by the following rules:$1$. Neutral structures are more stable than charged structures.$2$. Structures with complete octets are more stable.$3$. Structures with negative charge on more electronegative atoms and positive charge on less electronegative atoms are more stable.$4$. Structures with less charge separation are more stable.In the given structures:$(i)$ is a neutral molecule,so it is the most stable.(ii) and (iii) are charged structures. In (ii),the negative charge is on oxygen (more electronegative) and positive charge is on carbon. In (iii),the positive charge is on a secondary carbon and negative charge is on oxygen. However,comparing the extent of charge separation and octet completion,(ii) is more stable than (iii) because the positive charge in (ii) is adjacent to the electronegative oxygen atom,and the overall charge distribution is more favorable.Thus,the stability order is $i > ii > iii$.

Compare the relative stability of the following resonating structures:
$(i)$ $CH_3-CH=C(CN)-COCH_3$
(ii) $CH_3-CH=C(CN)-C^+(O^-)CH_3$
(iii) $CH_3-C^+(H)-C(CN)=C(O^-)CH_3$
(Note: The structures are provided in the image.)

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Compare the relative stability of the following resonating structures:$(i)$ $CH_3-CH=C(CN)-COCH_3$(ii) $CH_3-CH=C(CN)-C^+(O^-)CH_3$(iii) $CH_3-C^+(H)-C(CN)=C(O^-)CH_3$(Note: The structures are provided in the image.)