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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
- In Kjeldahl’s method,ammonia from 5g of food neutralizes 30 cm3 of 0.1 N acid.
- When 2-bromobutane reacts with alcoholic KOH, the reaction is called
- K₃Fe(CN)₆ + e⁻ → K₄Fe(CN)₆ is known as
- The turbidity of a polymer solution measures the
- Aqueous solution of Cu (II) gives an intense blue solution with ammonia,which is due
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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