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Phenol is heated with pthalic anhydride in the presence of concentrated H₂SO₄.

Phenol Is Heated With Pthalic Anhydride In The Presence Of Chemistry Question

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:

  1. Which of the following statements is correct for the spontaneous adsorption of a gas
  2. Which of the following is not the product of dehydration of
  3. P₂O₅ is an anhydride of
  4. Total number of isomers possible for the molecular formula C₄H₁₀O is
  5. At when pressure will a quantity of gas, which occupies 100 mL at a pressure of 720 mm

Topics: Alcohols Phenols and Ethers (80)
Subject: Chemistry (2512)

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