The decreasing order of stability of following cations is

P>Q>R>S

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Q>S>R>P

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Q>P>S>R

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Q>P>R>S

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Solution

The correct option is B Q>P>S>R
Order of stability of Carbocations
II is more stable due to $+ M, + I$ effect of $- N H_{2}$ group where as IV is more stable than III because $C l^{-}$ shows strong $+ M$ effect due to availability of lon pair.
Order of stability of carbocation is Q>P>S>R

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