1.

Which is the strongest acid? (pKa value is given in the bracket)  [MP PMT 1997; BHU 2003]

A.                 \[HCOOH\,(3.77)\]         
B.                 \[{{C}_{6}}{{H}_{5}}COOH\,(4.22)\]
C.                 \[C{{H}_{3}}COOH\,(4.71)\]        
D.                 \[C{{H}_{3}}C{{H}_{2}}COOH\,(4.88)\]
Answer» B.                 \[{{C}_{6}}{{H}_{5}}COOH\,(4.22)\]


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