To determine the increasing order of stability of the given resonance structures, we must analyze each structure based on resonance stabilization principles. Key factors influencing resonance stability include:
Octet Rule: Structures with complete octets are typically more stable.
Charge Separation: Lower charge separation results in greater stability.
Electronegative Atoms: Negative charges are more stable on more electronegative atoms while positive charges are more stable on less electronegative atoms.
Let's evaluate each structure:
Structure C: This structure is neutral with no charge separation and complete octets for all atoms. It is typically the most stable as it reflects the minimized energy configuration.
Structure D: Although it has a positive charge on a carbon atom, it allows the lone pair of electrons on nitrogen to stabilize the positive charge through resonance. This adds stability compared to structures with higher charge separation.
Structure A: There is a significant charge separation with a negative and a positive charge on the same structure. The positive charge is on a carbon atom, and the negative charge is not on an electronegative element, reducing stability.
Structure B: This structure has the most significant charge separation and less favorable positions for the charges, leading to the least stability. The positive charge is on oxygen, which is more electronegative than carbon, making it highly unstable.
Therefore, the increasing order of stability is: C, D, A, B.
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