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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.
Related Questions: - Alizarin belongs to the class of
- The compound that gives both iodoform and Fehling’s tests is
- Which ion is detected by Nessler’s reagent
- The reaction of an ester RCOOR’ with an alcohol R”OH in the presence of an acid
- The pH value of a 10 M solution of HCl is
Topics: Alcohols Phenols and Ethers
(80)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Alizarin belongs to the class of
- The compound that gives both iodoform and Fehling’s tests is
- Which ion is detected by Nessler’s reagent
- The reaction of an ester RCOOR’ with an alcohol R”OH in the presence of an acid
- The pH value of a 10 M solution of HCl is
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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