Alcohol, Phenol and EtherMedium

Question

Identify the colour of compound ' X ' in the sequence of the reaction.

Options

A.Violet
B.Green
C.Red
D.Colorless

Solution

Sol. [Key Concept: In excess NaOH the pink dianion of phenolphthalein adds ${OH}^{-}$ to give the colourless carbinol trianion X.]

Phenolphthalein indicator turns colourless in excess NaOH .

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