Give balanced chemical equations for the following con­versions:

(i) Ethanoic acid to ethyl ethanoate.

(ii) Calcium carbide to ethyne.

(iii) Sodium ethanoate to methane.

State which of the following statements does not describe the property of alkenes :

A: They are unsaturated hydrocarbons
B: They decolourise bromine water
C: They can undergo addition as well as substitution reactions
D: They undergo combustion with oxygen forming carbon dioxide and water.

Select from the list — Ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne

(i) The gas is used for welding purposes.

(ii) This gas is also a saturated hydrocarbon.

Using their structural formulae identify the functional group by circling them:

(i) Dimethyl ether.

(ii) Propanone