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When phenol reacts with phthalic anhydride in presence of H2SO4 and heated and hot reaction

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When phenol reacts with phthalic anhydride in presence of H2SO4 and heated and hot reaction mixture is poured in NaOH solution, then product formed is

(a) alizarin

(c) fluorescein

(b) methyl orange

(d) phenolphthalein.

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1 Answer

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Best answer

The correct option is: (d) phenolphthalein.

Explanation: 

Phenol couples with phthalic anhydride in presence of conc. H2SO4 to form phenolphthalein which is used as an indicator.

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