Which of the following compound gives pink colour on reaction with phthalic anhydride in conc.

Question:

Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$ followed by treatment with $\mathrm{NaOH}$ ?

 


Correct Option: , 2

Solution:

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