Popular Chemistry Online: To identify the functional group in the given organic compound

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Sunday, October 23, 2022

To identify the functional group in the given organic compound

Aim : To identify the functional group in the given organic compound.  

Material Required : Test tube, test tube stand, test tube holder, dropper litmus (blue) solution, dil. HCl, NaOH, Na metal, dil. H2SO4, CH3COOH.

Physical Properties:

State: Liquid 

Color: Colourless

Odor: Spirit like smell 

Water solubility: soluble

Flammability: Burn with non-sooty flame (Aliphatic) 

Preliminary test :

S.N.

Experiment

Observation

Inference

1.

Litmus test: Organic compound + 2

drops of litmus solution.

No change

-COOH or – OH is

absent

2.

Organic compound + dil. HCl + NaOH

No ppt or oily layer

-NH2 group is absent.

3.

Organic compound + Na metal

H2 gas evolves

  -OH(alcohol) group

    may be present

Confirmatory test :

S.N.

Experiment

Observation

Inference

1.

Cerric ammonium nitrate Test :

Organic compound + cerric ammonium nitrate

Red color appears

   -OH group is confirmed

2.

Ester Test : Organic compound + CH3COOH + Conc. H2SO4 (1 – 2 drops)

+ Heat.

Fruity smell of ester.

   

  -OH group is confirmed

Result : The functional group present in the given organic compound is alcoholic group (- OH)

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