A dye, phenolphthalein is prepared by reacting phenol with phthalic anhydride in acidic medium. It give pink colour in alkaline medium due to extended conjugation in a new complex formed (phthalein - dye test) identify the complex A :

Question

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Explanation Question:

Question is asking about the structure of product dye (A) obtained from the given reaction of phenolphthalein in basic medium.

Concept:

This question is based on Reaction of phenolphthalein in basic medium.

Solution:

Final Answer: Option (2)

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