Question

can someone explain why this is the coreect answer

5. Which of the following compounds is most acidic? III H II A) I B) II C) III D) both I & II E both II & III Ans: C

Answer 1

tnt :2+ a midazole) maa Base Eitut pyridine Base be pyrolle Base gmidazole, Pyridine, pyrolle all are base. Imidazole is most basic among all three then pyridine and lastly it is pyrolle. After accepting nt they form their Conjugated and respectively Now since pyrrole is weak Base among all the three then it's conjugate acid - will be strongest amoung the conjugate and of all the three Bases.

And also all the bases are aromatic- The conjugate and of the pyrolle after lossing ntion gain aromaticity back and this gain of aromaticity is the des driving force for this to be most audic. aromatich aromatic) 11 aromatic) aromatic) Most acidic) of non-aromatic This conversion an I Non-aromatic) ( Aromatich to aromatic o is driving force for this Rexh and hence it easy release ht ion and become aromatico