Rate of dehydration when given compounds are treated with conc. $H_{2} S O_{4}$ is:

P > Q > R > S

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Q > P > R > S

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R > Q > P > S

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R > Q > S > P

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Solution

The correct option is C $R > Q > P > S$
Order is $R > Q > P > S$

As R forms an intermediate having $3^{o}$ carbocation and shows resonance stabilisation, so, it is most stable.

Q : $2^{o}$ carbocation and resonance

P : $1^{o}$ carbocation and resonance

S : $2^{o}$ carbocation

Option C is correct.

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