The treatment of phenol with phthalic anhydride in the presence of concentrated sulphuric acid produces :

methyl orange

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phenolphthalein

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methyl red

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thymol blue

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Solution

The correct option is B phenolphthalein
In the presence of conc. sulphuric acid, one molecule of phthalic anhydride reacts with two molecules of phenol to form a molecule of phenolphthalein. A molecule of water is lost in this reaction. Thus, this is a condensation reaction.

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