Arrange the following in increasing order of pH value

II < I < III

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III < I < II

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III < II < I

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II < III < I

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Solution

The correct option is A II < I < III
(I) Benzene ring in aniline with single amine group is having electron density on nitrogen atom which releases the proton from it.

(II) Two benzene rings causes maximum inductive effect and maximizes stearic hindrance which is counterd by the highly electronegative nitrogen atom making it least acidic.

(III) In cyclohexane the electron withdrawing group are maximum causing inductive effect and releasing the proton very easily.

Option A is correct.

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