(A) Carboxylic acid gives effervescence with sodium bicarbonate R−COOH+NaHCO3​⟶RCOONa+CO2​↑+H2​O (B) Phenolic-OH gives characteristic colour with neutral FeCl3​ (C) Alcoholic-OH gives red colour with ceric ammonium nitrate (NH4​)2​[Ce(NO3​)6​]+2ROH⟶(Red)[Ce(ROH)2​.(NO3​)4​]​+2NH4​NO3​ (D) Purple colour of alkaline KMnO4​ is discharged by multiple bond of alkenes and alkynes