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JEE Main20264 April 2026Morning ShiftChemistryAlcohols Phenols and EthersActual

Identify the colour of compound 'X' in the sequence of the reaction.

Options

  1. AViolet
  2. BGreen
  3. CRed
  4. DColourless

Correct answer

D. Colourless

Step-by-step solution

The given reaction sequence represents the synthesis and acid-base behaviour of phenolphthalein. When phenol reacts with phthalic anhydride in the presence of concentrated H₂SO₄ , phenolphthalein is formed. In acidic or neutral medium, phenolphthalein exists in a lactone form which is colourless. Upon addition of a moderate amount of alkali (NaOH), the lactone ring opens and a proton is removed, forming a dianion with an extended conjugated quinonoid structure. This extended conjugation is responsible for the chara

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