The decreasing order of acidity of following phenol derivatives is

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$R > S > Q > P$

$S > Q > R > P$

$P > S > Q > R$

$P > Q > R > S$

answer is A.

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Detailed Solution

-M and -I will increase acidity -M is effective at ortho and para positions only while -I effect will operate at all position but it is distance dependent.
+M and +I will decrease acidity but +M will be effective at ortho and para only . H-bonding in phenol derivative is also consider for the comparison of acidity.

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