(START WRITING IN RHS and continue writing using both sides LHS and RHS )
EXPERIMENT 11 To test the presence of ketone Date:
Aim:-
To analyse the given organic compound and identify and confirm the functional group present in it
Sl. No. | EXPERIMENT | OBSERVATION | INFERENCE |
PRELIMINARY TESTS |
1. | Colour noted | No characteristic colour | Absence of phenol and aniline |
2.
| odour noted | nail polish remover smell | May be ketone acetone |
3. | Test with litmus paper: A little of the substance is placed on moist litmus paper | No colour change is noted
| Absence of carboxylic acid, phenol and amine |
TEST FOR ALIPHATIC OR AROMATIC |
1. | A little of the substance is taken in a nickel spatula and shown to flame.
| Burnt with a non-smoky flame
| Presence of Aliphatic substance
|
TEST FOR UNSATURATION |
1. | Test with bromine water: Take small amount of the organic compound in a test tube add 2 ml of distilled water to dissolve it. To this solution add few drops of bromine water and shake it well. | No decolourisation.
| Substance is saturated.
|
TEST FOR CARBONYL GROUP – CAN BE EITHER ALDEHYDE OR KETONE |
1. | 2,4-DINITROPHENYL HYDRAZINE TEST (2,4-DNP TEST) Take 0.5ml of the given compound in a clean dry test tube, add a few drops of 2,4-dinitrophenyl hydrazine solution. Shake the mixture and allow to stand. | Formation of yellow or orange crystals
| Presence of carbonyl group that is –CO- group
|
Chemistry :-  |
IDENTIFICATION TEST FOR KETONES
|
1. | m-DINITROBENZENE TEST:- Place 0.5ml of the given liquid in a clean test tube and add about 0.1g of finely powered m-dinitrobenzene. Now add 1ml of dilute NaOH solution and shake | Appearance of violet colour which slowly fades
| Presence of ketonic group
|
CONFIRMATORY TEST FOR KETONES |
1 | SODIUM NITROPRUSSIDE TEST:- Dissolve a crystal of sodium nitroprusside in about 1ml of distilled water in a clean test tube and then add 0.5ml (or 0.5g) of the given compound. Shake and add sodium hydroxide solution dropwise. | Red colouration
| Presence of ketonic group confirmed |
2 | Iodoform test for methyl ketonic groups CH3CO- Take 1ml of organic compound ina test tube and add about 1ml of 1% iodine solution and add dil. NaOH dropwise until the brown colour of iodine discharged. Warm in water bath
| Formation of yellow precipitate | Presence of methyl ketone |
Chemistry 
|
RESULT : The given organic compound is identified and confirmed as Aliphatic saturated ketone ( propanone or acetone)
