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To which class of dyes does phenolphthalein belong ?

$(a)\;azo \;dyes\qquad(b)\;triphenylmethane\;dyes\qquad(c)\;nitro\;dyes\qquad(d)\;phthalein\;dyes$

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Answer : phthalein dyes
Explanation :
Phenolphthalein is a typical dye belonging to the class which contains in it a phthalein group as the functional group i .e . phthalein dyes .
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