Correct stability order of resonating structure is:

Correct stability order of resonating structure is:
  1. \(\mathrm{P} > \mathrm{Q} > \mathrm{R} > \mathrm{S}\)
  2. \(\mathrm{P} > \mathrm{Q} > \mathrm{S} > \mathrm{R}\)
  3. \(\mathrm{P} > \mathrm{R} > \mathrm{Q} > \mathrm{S}\)
  4. \(\mathrm{P} > \mathrm{S} > \mathrm{Q} > \mathrm{R}\)

Solution

The most stable resonating structure is the one with no charge separation. This corresponds to \(\mathrm{P}\). This is followed by Q as it has an octet of all atoms complete. None of them is electron deficient. The resonating structure with a positive charge on a relatively electropositive atom and negative charge on the electronegative atom is more stable than the reverse case. Order of stability is:- \(\mathrm{P} > \mathrm{Q} > \mathrm{R} > \mathrm{S}\)

Asked in: JEE-TOPICTESTS-CHEMISTRY

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