CPrac M - Organic QA

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Last updated 3:19 AM on 6/26/26
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10 Terms

1
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  1. NO BUNSEN BURNER

  1. Take all test as individual tests (so ignore the rest) 

  • Eg. Even though previous test indicated ketone only, if there is 2,4-DNPH, still say ketone OR aldehyde present 

  1. FA1 CxHyO3 = 1 phenol + 1 COOH 

  • 1 mol of FA1 reacts with: 2 mol Na and 1 mol H2 

  1. Do NOT use Na for practical (use what is given in table)

2
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Observations for Add to the solution 2 cm depth of Br2 water 

  1. Add to the solution 2 cm depth of Br2 water 

  • Orange bromine decolourised

  • 2 colourless immiscible layers are formed 

3
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Observations for Add Br2(aq) dropwise to compound and shake (cyclohexane VS phenol)

Add Br2(aq) dropwise to compound and shake

  • Cyclohexane: Orange Br2(aq) decolourised

  • Phenol: Orange Br2(aq) decolourised and white ppt. Formed

4
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Observation for Acidify KMnO4 with H2SO4, then add a few drops to compound to methylbenzene

  1. Acidify KMnO4 with H2SO4, then add a few drops to compound

  • Methylbenzene: Decolourise + white ppt. 

5
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Observation for Add solid Na2CO3 to compound and warm in a water bath for carbo acid

  1. Add solid Na2CO3 to compound and warm in a water bath

  • Carboxylic acid: Effervescence of CO2 which gives a white ppt. with limewater

6
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These tests, look out for…

Add 2 cm3 of FA2 to 2 cm3 of water.

Add 2 cm3 of FA2 to 2 cm3 of NaOH(aq)

Add Br2(aq) dropwise to compound and shake

Add 2 cm3 of FA2 to 2 cm3 of water.

Test for solubility in water 

Add 2 cm3 of FA2 to 2 cm3 of NaOH(aq)

Test for acidic groups (carboxylic acid & phenol)

Add Br2(aq) dropwise to compound and shake

Test for alkene, phenol, phenylamine

7
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For these observations, state the deduction

Observation

Two colourless immiscible

layers are formed

No brick-red ppt (For Fehling’s solution) 

Observation

Deduction 

Two colourless immiscible

layers are formed

  • FA2 is insoluble in water

No brick-red ppt (For Fehling’s solution) 

  • Aliphatic aldehyde is absent 

8
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<p>State observation and deductions for this test </p>

State observation and deductions for this test

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9
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Describe tests in detail for planning (Eg. DNPH, iodoform, KMnO4 one)

  1. Describe tests in detail

  • Eg. Add 2 cm depth of the organic compound to a test-tube. Add a few drops of 2,4-dinitrophenylhydrazine

  • Eg. Add 2 cm depth of the organic compound to a test-tube. Add I2 in NaOH and warm in a water bath.

  • Eg. Add 2 cm depth of the organic compound to a test-tube. Add 1 cm depth of dilute H2SO4 and a few drops of aqueous KMnO4, and warm in a water bath

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