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Q.

To which class of dyes, does phenolphthalein belong 

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a

Nitro dyes 

b

Azo dyes 

c

Triphenyl methane dyes

d

Phthalein dyes

answer is D.

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Detailed Solution

  • Phenolphthalein is often used as an indicator in acid–base titrations. 
  • For this application, it turns colorless in acidic solutions and pink in basic solutions. 
  • It belongs to the class of dyes known as phthalein dyes.
  • Chemical formula:C20​H14​O4​
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