The correct stability order of the following | vedclass

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Question

(B) The stability of resonance structures is determined by the following rules:$1$. Structures with more covalent bonds are more stable.$2$. Structure

Vedclass · Accepted Answer

$III > II > I$

Vedclass · Answer

(B) The stability of resonance structures is determined by the following rules:$1$. Structures with more covalent bonds are more stable.$2$. Structures with complete octets for all atoms are more stable.$3$. Structures with negative charge on a more electronegative atom and positive charge on a less electronegative atom are more stable.Analyzing the given structures:- Structure $III$ $(CH_3-CH=CH-CHO)$ is a non-polar structure with the maximum number of covalent bonds and complete octets for all atoms,making it the most stable.- Structure $II$ $(CH_3-CH^+-CH=CH-O^-)$ has a negative charge on the oxygen atom,which is more electronegative than carbon,making it more stable than structure $I$.- Structure $I$ $(CH_3-CH^--CH=CH-O^+)$ has a negative charge on a carbon atom and a positive charge on an oxygen atom,which is unfavorable due to the electronegativity difference,making it the least stable.Therefore,the correct stability order is $III > II > I$.

The correct stability order of the following resonance structures of $CH_3-CH=CH-CHO$ is:

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(Note: The structures are provided in the image.)

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