Q.

The decreasing order of acidity of following benzoic acid derivatives is

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a

Q>S>P>R

b

S>R>Q>P

c

P>R>Q>S

d

P>S>Q>R

answer is A.

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Detailed Solution

Ortho substituted benzoic acid is more acidic than meta and para acid because of ortho effect. In case of meta and para acidity can be compared by -M, +M,-I and +I groups.

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The decreasing order of acidity of following benzoic acid derivatives is