Which from following amines has highest pK_b value ?

MHT CET 2024 Chemistry question

Which from following amines has highest value ?

(A)ArylamineCorrect
(B)Tertiary arylalkanamine
(C)Secondary alkanamine
(D)Primary alkanamine

Answer: (A)

Solution

A higher means a weaker base (). In arylamines the lone pair on nitrogen is delocalised into the benzene ring by resonance and is much less available for protonation, so they are the weakest bases in the list ( of aniline = 9.38). Hence (A). A tertiary

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Question ID VK-096827