Tuesday, January 22, 2019

Identification of alcoholic functional group

Aim: To identify the functional group present in an organic compound.

Preliminary test:

(i) Physical State
Liquid
(ii) Colour
Colourless
(iii) Odour
Spirit like
(iv) Solubility in water
Soluble

Chemical Test:

S.No.
Experiment
Observation
Inference
1
Test for Unsaturation
Dissolve 0.2 mL of organic compound in 2 mL CCl4. Then added bromine water dropwise.

Brown colour of bromine not discharged

Unsaturation is not present
2
Litmus Test:
Put a drop of an aqueous solution of the original substance on a piece of blue and red litmus paper

No reaction

Organic substance is neutral in nature.
3
Flame Test:
Touch the organic substance on copper wire and ignite it

Organic substance shows non-sooty flame

Compound is aliphatic
4
Functional Group Analysis:
      (i) Sodium metal test:
          Organic substance + a piece of sodium metal  

(ii) CERIC AMMONIUM NITRATE TEST:
Aq. Solution of organic substance + ceric ammonium nitrate solution

(iii) ESTER TEST:
Organic substance + solid sodium acetate + conc. H2SO4 + heat

H2 gas is evolved with brisk effervescence


Colour of solution change to red


Fruity smell is evolved

Alcoholic(-OH) group is present


Alcoholic(-OH) group is present


Alcoholic(-OH) group is present


Result: The given organic compound contains the alcoholic functional (-OH) group.

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