Question

upus Rank the following compounds in order of pka from strongest acid to weakest acid for the alpha proton. OD > B>CA A > C>

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Answer #1

A>C>B>D. As A doesnot have any mesomeric effect than c and b and the alpha proton is bridged between two electron withdrawing groups. Thats why A is more acidic. And C is more acidic than B as B has electron donating secondary amino group compared to oxygen. Finally remains D which has only one electron withdrawing group i.e. keto group.

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