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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: - Which of the following does not represent the correct order of the properties
- At 27⁰C latent heat of fusion of a compound is 2930 J/mol. Entropy change is
- The silver salt of a fatty acid on refluxing with an alkyl halide gives an
- If 300 mL of a gas at 27⁰ C is cooled to 7⁰C at constant pressure, its final volume
- A compound gives a positive test with I₂/NaOH and is extracted from benzene
Topics: Alcohols Phenols and Ethers
(80)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following does not represent the correct order of the properties
- At 27⁰C latent heat of fusion of a compound is 2930 J/mol. Entropy change is
- The silver salt of a fatty acid on refluxing with an alkyl halide gives an
- If 300 mL of a gas at 27⁰ C is cooled to 7⁰C at constant pressure, its final volume
- A compound gives a positive test with I₂/NaOH and is extracted from benzene
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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