Organic Tests

Some tests that are required for carbonyl compounds and alcohols, for identification.

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  • Created by: LenBon
  • Created on: 30-04-12 10:17
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Test Reagent(s) / Condition(s) Result
T1 Alkene (C=C) Bromine water / shake Decolourise
T2 Alkene (C=C) Cold alkaline potassium manganate(VII) Purple to green (brown)
T3 Chloroalkane Alkaline hydrolysis White precipitate (soluble in aq.
Acidification (HNO3) ammonia)
Add aq. Silver nitrate.
Bromoalkane Cream precipitate (partially
soluble in aq. ammonia)
Iodoalkane Yellow precipitate (insoluble in
aq. ammonia)
T4 Alcohol (1º OH) Aq. potassium dichromate(VI) acidified with Orange to green colour
dilute sulphuric acid.
Alcohol (2º OH) Purple to colourless
T5 Alcohol (1º, 2º, 3º OH) Dry test tube add solid Steamy acidic white fumes of
Phosphorus(V) chloride (PCl5) hydrogen chloride.
T6 Carboxylic acid (COOH)
T7 Carboxylic acid (COOH) Sodium carbonate Effervescence / +ve limewater
T8 Aldehyde (CHO) 2,4-dinitrophenylhydrazine Yellow-orange crystalline
T9 Ketone (C=O)
T10 Aldehyde (CHO) Ammoniacal silver nitrate Silver mirror
T11 Aldehyde (CHO) Fehling's solution Red-brown precipitate
T12 Methyl ketone (COCH3) Iodine in the presence of alkali Pale yellow precipitate of
(or ethanal) or potassium iodide and sodium chlorate(I) triiodomethane (iodoform)
T13 Methyl secondary alcohol
(CHOHCH3) (or ethanol)
Alcohol (3º OH) Dry test tube add solid Fizzes
Phosphorus(V) chloride (PCl5) Steamy acidic white fumes of
hydrogen chloride.
Aq. potassium dichromate(VI) acidified with Remains orange
dilute sulphuric acid.
Aq. potassium manganate(VII) acidified Remains purple
with dilute sulphuric acid.


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