Reaction of phenol with which of the following reagents form picric acid?
Show Hint
- Conc. $ \text{H}_2\text{SO}_4 $
- dil. $ \text{H}_2\text{SO}_4 $
- Conc. $ \text{HNO}_3 $
- dil. $ \text{HNO}_3 $
The Correct Option is C
Solution and Explanation
Step 1: Understand the structure of phenol and picric acid.
Picric acid is 2,4,6-trinitrophenol.
Step 2: Recall the nitration of phenol.
Phenol is activated towards electrophilic substitution.
Step 3: Consider the reagents.
Conc. HNO3 is a strong nitrating agent.
Dil. HNO3 leads to mono-nitration.
H2SO4 leads to sulfonation.
Step 4: Identify the correct reagent for picric acid formation.
Concentrated HNO3 nitrates phenol at the 2, 4, and 6 positions.
Step 5: Conclusion.
Conc. HNO3 reacts with phenol to form picric acid.
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