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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: - The number of atoms in 0.1 mol of a triatomic gas is (Na = 6.02 x 10²³ mol⁻¹)
- Toluene can be oxidised to benzoic acid by
- In the gas phase reaction C₂H₂ + H₂ ⇌ C₂H₆, the equilibrium constant
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2SO₂ + O₂ ⇌ 2SO₃,
increasing the total pressure leads to
Topics: Alcohols Phenols and Ethers
(80)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The number of atoms in 0.1 mol of a triatomic gas is (Na = 6.02 x 10²³ mol⁻¹)
- Toluene can be oxidised to benzoic acid by
- In the gas phase reaction C₂H₂ + H₂ ⇌ C₂H₆, the equilibrium constant
- Germanium of very high purity is obtained by
- In the chemical reaction 2SO₂ + O₂ ⇌ 2SO₃, increasing the total pressure leads to
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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