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Question

Identify the strongest and the weakest bases among the following.

The strongest acid and the weakest base respectively are:

A
III and IV
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B
IV and II
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C
I and IV
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D
I and III
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Solution

The correct option is C I and IV

(I) is the strongest acid because N is already protonated and will easily loose H+ to become neutral.
(IV) is the weakest base as lone pair of N is in conjugation with benzene ring as well as electron withdrawing CO group.


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