A dye, phenolphtnalein is prepared by re...

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

A

B

C

D

None

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The correct Answer is:

B

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