Question

The order of relative stability of the contributing structure is:

Choose the correct answer from the options given below:

• A. $I >II >III$
• B. $II >I >III$
• C. $I = II = III$
• D. $III >II >I$

Answer 1

Answer: (A)

$I >II >III$

Answer 2

Structure I is the most stable because it is a neutral resonating structure. In general, neutral structures are more stable compared to charged structures.

Structure II is less stable than I because it involves a positive charge on a less electronegative atom compared to structure III. However, it is more stable than III because the negative charge in III is on a carbon atom, making it the least stable due to charge separation.

Structure III is the least stable among the three due to the presence of a negative charge on carbon and overall charge separation, making it highly unstable.
The Correct answer is: $I >II >III$