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Question

Choose the correct statement regarding resonating structures (i) and (ii) :


A
Structure (i) is less stable than structure (ii)
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B
Structure (i) is more stable than structure (ii)
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C
Structure (i) and structure (ii) are equally stable.
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D
Cannot comment about stability.
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Solution

The correct option is B Structure (i) is more stable than structure (ii)
Rule :
A polar structure with complete octet is more stable than a polar structure with incomplete octet.
Since both the structures have charges, here we will look for that structure that has complete octet of all the atoms.
Structure (i) has a complete octet of all three carbon atoms and nitrogen whereas octet of carbocation in structure (ii) is not complete.
Option (b) is correct.

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