Organic Chemistry Chemical Tests

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Can you name the organic chemical tests?

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H2O + NH3 → OH- + NH4+
Test and +ve resultInference(s)No. (level)
Add phosphorus(V) chloride. Steamy fumes given off that turn damp blue litmus paper red.2 (AS)
Add sodium or potassium carbonate or hydrogencarbonate solution. Effervescence.1 (AS)
Add a small piece of sodium. Effervescence (bubbles), sodium dissolves, white solid formed.3 (2xAS + 1xA2)
Warm with acidified potassium dichromate(VI). Orange solution turns green3 (being specific here) (AS)
Warm with carboxylic acid and a few drops of concentrated sulfuric acid. Ester smell, eg glue-like.1 (A2)
Iodine in alkaline solution. Pale yellow precipitate formed.1 (A2)
Shake with bromine water. Yellow solution is decolorised and white precipitate also formed.1 (A2)
Test and +ve resultInference(s)No. (level)
Shake with bromine water. Yellow solution is decolorised1 (AS)
Boil with Fehling’s or Benedict’s solution. Blue solution gives red precipitate.1 (AS)
Shake with 2,4−dinitrophenylhydrazine solution. Orange precipitate formed.2 (A2)
Warm with aqueous sodium/potassium hydroxide, acidify with dilute nitric acid then add aqueous silver nitrate. 3 possible precipitates: White, Cream, Yellow.3 (Ans: C-[1], C-[2], C-[3] in order given) (AS)
Warm with ammoniacal silver nitrate (Tollens’ reagent). Silver mirror forms on glassware or grey-black precipitate forms.1 (AS)
Sodium nitrite and dilute hydrochloric acid followed by an alkaline solution of phenol in ice-cold conditions. Orange precipitate formed1 (A2)

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