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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: - Action of nitrous acid on ethyl amine gives
- At equilibrium, the value of change in Gibb’s free energy (ΔG) is
- The amount of zinc required to produce 224mL of H₂ at STP on treatment with dilute H₂SO₄
- Which of the following compound react with NaHCO3 solution to give sodium salt
- Which of the following is the most electronegative element?
Topics: Alcohols Phenols and Ethers
(80)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Action of nitrous acid on ethyl amine gives
- At equilibrium, the value of change in Gibb’s free energy (ΔG) is
- The amount of zinc required to produce 224mL of H₂ at STP on treatment with dilute H₂SO₄
- Which of the following compound react with NaHCO3 solution to give sodium salt
- Which of the following is the most electronegative element?
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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