Phenolphthalein is obtained by heating phthalic anhydride with conc. \( \text{H}_{2}\text{SO}_{4} \) and:
Show Hint
- benzyl alcohol
- benzene
- phenol
- benzoic acid
The Correct Option is C
Solution and Explanation
Phenolphthalein is a phthalein dye synthesized via a condensation reaction.
Step 2: Analysis
Heating phthalic anhydride with phenol in the presence of concentrated $\text{H}_{2}\text{SO}_{4}$ (as a dehydrating agent) yields phenolphthalein.
Step 3: Conclusion
The required reagent is phenol.
Final Answer: (C)
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