Name the following compounds.

(i)

(ii)

Write the molecular formula of ethene and also give three succeeding members with their names.

Give reasons for the following.

(i) Unsaturated hydrocarbons show addition reaction.

(ii) Alcohol supplied for industrial purpose is mixed with copper sulphate.

(i) What is black gold and how is it formed? (ii) Why coal and petroleum are considered as air pollutants?

A substance (X) be oxidised to acetic acid (CH₃COOH)? Name substance (X) and write two tests to demonstrate acidic nature of acetic acid.