When an organic compound is heated with phthalic anhydride in the presence of concentrated , it forms a colorless solid . When is treated with aqueous , it produces a beautiful deep pink colored solut

Question

When an organic compound $X$ is heated with phthalic anhydride in the presence of concentrated $H_2SO_4$, it forms a colorless solid $Y$. When $Y$ is treated with aqueous $NaOH$, it produces a beautiful deep pink colored solution. Compound $X$ is:

Prashant Kotian · Accepted Answer

Correct answer: B. Phenol reacts with phthalic anhydride in the presence of concentrated to undergo a condensation reaction, forming phenolphthalein. Phenolphthalein is colorless in an acidic medium but forms a deep pink-colored sodium salt when treated with an alkali (). This is known as the Phthalein dye test.

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