A dilute solution of p-rosaniline hydrochloride in water whose pink colour has been discharged by passing sulphur dioxide, does not restore its colour by
A. HCHO
B. CH2CHO
C. (CH3)2COCH3
D. CCl3CHO
Answer:C
A dilute solution of p-rosaniline hydrochloride in water whose pink colour has been discharged by passing sulphur dioxide, does not restore its colour by
A. HCHO B. CH2CHO C. (CH3)2COCH3 D. CCl3CHO