Phenol when condensed with phthalic anhydride in presence of conc.H2SO4, yields:
A
Methyl orange
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B
Phenolphthalein
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C
Phenol red
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D
Salicylic acid
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Solution
The correct option is B Phenolphthalein Phenol couples with phthalic anhydride in the presence of conc. H2SO4 to form phenolphthalein which is used as an indicator.