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(D) The phthalein dye test is a characteristic chemical test used to identify the presence of phenolic groups.In this test, a phenol reacts with phtha

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$(4)$ Phenolic

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(D) The phthalein dye test is a characteristic chemical test used to identify the presence of phenolic groups.In this test, a phenol reacts with phthalic anhydride in the presence of concentrated sulphuric acid $(H_2SO_4)$ as a dehydrating agent.This reaction results in the formation of a phthalein dye (such as phenolphthalein), which exhibits a distinct color change in an alkaline medium.Therefore, the correct functional group identified by this test is the phenolic group.

The functional group that can be identified through the phthalein dye test is:

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