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.

State the observation : The gaseous product from dehydration of ethanol is passed through bromine water.

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

(i) Dimethyl ether.

(ii) Propanone

Name the following :

(i) The process by which ethane is obtained from ethene.

(ii) A hydrocarbon which contributes towards the greenhouse effect.

(iii) The distinctive reaction that takes place when ethanol is treated with acetic acid.

(iv) The property of elements by virtue of which atoms of the element can link to each other in the form of a long chain or ring structure.

(v) The reaction when an alkyl halide is treated with alcoholic potassium hydroxide.