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A compound ‘X’ when treated with phthalic anhydride in presence of concentrated H 2 SO 4 yields ‘Y’. ‘Y’ is used as an acid/base indicator. ‘X’ and ‘Y’ are respectively

1. Anisole, methyl orange
2. Salicylaldehyde, Phenolphthalein
3. Toludine, Phenolphthalein
4. Carbolic acid, Phenolphthalein

Correct answer: Carbolic acid, Phenolphthalein

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