Q.

Which of the following aryl amine has highest value of pkb 

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a

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b

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c

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d

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answer is D.

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Detailed Solution

Electron withdrawing power of -NO2 > -CHO > -Cl

EWG decreases the basic strength 

 basic strength of 3 > 1 > 2 > 4

pkb of 3 < 1 < 2 < 4

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