A compound ‘X’ when treated with phthalic anhydride in presence of concentrated H₂SO₄4 yields ‘Y’. ‘Y’ is used as an acid/base indicator. ‘X’ and ‘Y’ are respectively
(1) Carbolic acid, Phenolphthalein
(2) Anisole, methyl orange
(3) Salicylaldehyde, Phenolphthalein
(4) Toludine, Phenolphthalein