Fri September 21, 2012 By:

basic order

Expert Reply
Sat December 08, 2012
Pyrrole is a very weak base with a pKa of about -1 to -2.
Pyrazole       14.0
Imidazole     14.5
Thiazole       2.5
Isoxazole     -3.0
pyrrole         -1 to -2
We know smaller Pka value means Stronger acidity or weak base and vice versa. So, imidazole and pyrazole are stronger bases.
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