The increasing order of the pK_b of the follo | vedclass

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(A) The $pK_b$ value is inversely proportional to the basic strength of the compound.Basic strength depends on the availability of the lone pair on th

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$(c) < (a) < (d) < (b)$

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(A) The $pK_b$ value is inversely proportional to the basic strength of the compound.Basic strength depends on the availability of the lone pair on the nitrogen atom.Electron-donating groups $(EDG)$ increase basicity (decrease $pK_b$),while electron-withdrawing groups $(EWG)$ decrease basicity (increase $pK_b$).The substituents on the phenyl ring are: $(A) -F$ ($EWG$ by inductive effect),$(B) -OCH_3$ ($EDG$ by resonance),$(C) -NO_2$ (strong $EWG$),$(D) -CH_3$ ($EDG$ by hyperconjugation).Basicity order: $(B) > (D) > (A) > (C)$.Since $pK_b$ is inversely proportional to basicity,the increasing order of $pK_b$ is: $(C) < (A) < (D) < (B)$.

The increasing order of the $pK_b$ of the following compounds is:

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