The correct stability order of the given resonating structures is:a)I II IIIb)III I IIc)I III IId)II III ICorrect answer is option 'B'. Can you explain this answer?

Question

The correct stability order of the given resonating structures is:a)I > II > IIIb)III > I > IIc)I > III > IId)II > III > ICorrect answer is option 'B'. Can you explain this answer?

Answer

Here 2 rule of resonance stabilising  rule works ...1 . more the number of bond more stable  in resonance... 2. + ve charge in electronegative decreasing resonance stability ... Now for 1 2 3 , 1 and   1 and 3 has greater number of bond so 1 and 3 is greater stable than 2 ... compare 1 and 3 ..for 1 positive charge on Oxygen which is more electronegative than N ...so 1 has less stable  than 3 ...so order is 3 > 1 >2

Answer

In 2 the carbonation is 1 degree and the +ve charge on electronegative element is less stable

Answer

Resonating structures are stable due to octate rule as
structure 1,and 3 both are octate filled up thus these two structures are most stable but structure 2 is 6 electronic state this is less stable.As 1,3 are both octate filled up electronegativity order considered en order oxygen>nitrogen so positive charge on less electronegative group is more stable thus the order becomes 3>1>2.

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