Tamil Nadu Board Class 12 Chemistry Practical

Note the odour of the organic

compound.

(ii) Bitter almond odour

(iii) Phenolic odour

(iv) Pleasant fruity

odour

(ii) May be benzaldehyde

(iii) May be phenol

May be an ester

Touch the moist litmus paper

with an organic compound.

(ii) Red litmus turns

blue

(iii) No colour change is noted

(ii) May be an amine

(iii) Absence of carboxylic

acid, phenol and amine

Take 2 ml of saturated sodium

bi carbonate solution in a test

tube. Add 2 or 3 drops (or a pinch of solid) of an organic compound to it.

(ii) No brisk

effervescence

(ii) Absence of a carboxylic acid.

Take a small amount of an organic compound in a test tube. Add 3 ml of Borsche’s reagent, 1 ml of Conc HCl to it, then warm the mixture gently and cool it.

Take a small amount of an

organic compound in a dry test

tube. Add 2 ml of conc H₂SO₄

to it, and heat the mixture.

Take small amount of the organic compound in a Nickel spatula and burn it in Bunsen flame.

flame

(ii) Burns with non

sooty flame

(ii) Presence of an aliphatic compound

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.

colour of bromine water is decolourised

(ii) No decolourisation

takes place

(iii) Decolourisation

with formation of white precipitate.

unsaturated.

(ii) Substance is saturated.

(iii) Presence of an aromatic

amine or phenol.

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 very dilute alkaline KmnO₄ solution and shake it well.

KmnO₄ solution is

decolourised

(ii) No decolourisation

takes place

Unsaturated.

(ii) Substance is

unsaturated.

Take 1 ml of neutral ferric chloride solution is taken in a dry clean test tube. Add 2 or 3 drops (or a pinch of solid) of organic compound to it. If no colouration occurs add 3 or 4 drops of alcohol.

(ii) violet – blue

colouration is seen

(iii) green colouration is seen

(ii) Presence of α–naphthol

(iii) Presence of β– naphthol

Take 1 ml (or a pinch of solid)

of an organic compound in a clean test tube. Add 1 ml of ethyl alcohol and 4 to 5 drops of conc. sulphuric acid to it. Heat the reaction mixture strongly for about 5 minutes. Then pour the mixture into a beaker containing dil. Sodium carbonate solution and note the smell.

Take 2 ml of Tollen’s reagent in a clean dry test tube. Add 3-4 drops of an organic compound (or 0.2 g of solid) to it, and warm the mixture on a water bath for about 5 minutes.

Take 1 ml each of Fehling’s solution A and B are taken in a test tube. Add 4-5 drops of an organic compound (or 0.2g of solid) to it, and warm the mixture on a water bath for about 5 minutes.

A small amount of the substance is taken in a test tube. 1 ml sodium nitro prusside solution is added. Then sodium hydroxide solution is added dropwise.

Take A small amount of an organic substance in a clean test tube, add 2 ml of HCl to dissolve it. Add few crystals of NaNO₂, and cool the mixture in an ice bath. Then add 2 ml of ice cold solution of β-naphthalene NaOH.

obtained.

Take A small amount of an organic compound in a test tube. Heat strongly and then allow to cool. Dissolve the residue with 2 ml of water. To this solution Add 1 ml of

dilute copper sulphate solution and few drops of 10% NaOH solution drop by drop.

Take A small amount of an organic compound in a test tube. It is dissolved in 2 ml of water. Add 3-4 drops of alpha naphthol to it.Then add conc H₂SO₄ through the sides of test tube carefully.

formed at the junction of the two liquids.

Take A small amount of an organic compound in a test tube. Add 1 ml of phenyl hydrazine solution and heat the mixture for about 5 minutes on a boiling water bath.

obtained