question_answer

Which one among the following contains a phenolic-OH group? 

A)  Oxalic acid     

B)  Formic acid

C)  Picric acid  

D)  Citric acid

Correct Answer: C

Solution :

 Key Idea: Draw all the structures to find which of them has phenolic -OH group. [a] Oxalic acid \[\underset{COOH}{\overset{COOH}{\mathop{|}}}\,\] [b] From acid \[HCOOH\] [c] Picric acid [d] Citric acid \[HOOC-C{{H}_{2}}-\underset{COOH}{\overset{OH}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-C{{H}_{2}}-COOH\] \[\therefore \]Picric acid has phenolic -OH group.