Maximum pK_bvalue is for

(CH₃)₂NH

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(CH₃ CH₂)₂NH

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C₆H₅NHC₆H₅

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C₆H₅NHCH₃

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Solution

The correct option is C
C₆H₅NHC₆H₅

Lesser the basic nature, more is the pK_b value. Diphenyl amine is least basic as lone pair of electrons in more involved in resonance and electrons are not readily available for donation.

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