Correct stability order of resonating structure is:

P > Q > R > S

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P > Q > S > R

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P > R > Q > S

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P > S > Q > R

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Solution

The correct option is A $P > Q > R > S$
The most stable resonating structure is the one with no charge separation. This corresponds to $P$ .
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:-
$P > Q > R > S$

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