(B) Fluorescein,also known as resorcinolphthalein,is a classic example of a phthalein dye. It is synthesized by the condensation reaction of phthalic

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(B) Fluorescein,also known as resorcinolphthalein,is a classic example of a phthalein dye. It is synthesized by the condensation reaction of phthalic anhydride with resorcinol in the presence of a catalyst like anhydrous zinc chloride $(ZnCl_2)$. Due to its structure containing the phthalein backbone,it is classified under phthalein dyes.