GPAT Practice Questions - Graduate Pharmacy Aptitude Test Exam

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Which functional group is responsible for the characteristic blue colour produced by phenolphthalein in alkaline solution?

An extended quinoid (para-quinoid) chromophore formed after lactone ring opening A free phenolic hydroxyl with no conjugation A saturated lactone carbonyl A protonated tertiary amine

Correct Answer:

An extended quinoid (para-quinoid) chromophore formed after lactone ring opening

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