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Which one of these is not an example of a basic drug with pKa range 5-11?

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Which one of these is not an example of a basic drug with pKa range 5-11?

(a) Cromolyn

(b) Imipramine

(c) Amitriptyline

(d) Chloroquine

I have been asked this question during an interview.

Origin of the question is Drugs Absorption topic in division Absorption of Drugs of Drug Biotechnology

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The correct choice is (a) Cromolyn

To elaborate: Cromolyn pKa is 2.5. Rest all the other drugs are bases of Pka range 5-11.  These are morphine analogues. Such drugs are better absorbed from relatively alkaline conditions of the intestine where these molecules largely exist in unionized form.

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