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Phenol is heated with pthalic anhydride in the presence of concentrated H₂SO₄.The product gives pink colour with alkali. The product is
Options
(a) salicylic acid
(b) bakelite
(c) phenolphthalein
(d) fluorescein
Correct Answer:
phenolphthalein
Explanation:
When phenol is heated with phthalic anhydride and a few drops of concentrated sulphuric acid (H₂SO₄) are added, phenolphthalein is formed. On adding excess of sodium hydroxide to this product, a pink colour is produced. This process is called phthalein fusion test.
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Topics: Alcohols Phenols and Ethers
(80)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The number of carbon atoms in Buckminsterfullerene is
- Equal volumes of two monatomic gases,A and B at same temperature and pressure
- The van’t Hoff factor for a solute that associates in solution is
- The oxidation states of Mn in MnSO₄,MnO₂,K₂MnO₄ and KMnO₄ are respectively
- Which of the following oxidation states are the most characteristic for lead
Topics: Alcohols Phenols and Ethers (80)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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