11 (a) Explain the difference in structure between an alkane and an alkene. (b) Name the alkane and the alkene each of which have two carbon atoms in a molecule. (c) Describe a test, with results, to distinguish between an alkane and an alkene. (d) Name a type of product made from alkenes.

here are the answers to your chemistry questions.

11 (a)
Alkanes are saturated hydrocarbons containing only carbon-carbon single bonds. Alkenes are unsaturated hydrocarbons containing at least one carbon-carbon double bond.

11 (b)
alkane: Ethane
alkene: Ethene

11 (c)
Test: Add aqueous bromine (bromine water) to both the alkane and the alkene.
Results:

• The alkane will show no change; the bromine water will remain orange/brown.
• The alkene will decolourize the bromine water, turning it colourless. This is because alkenes undergo an addition reaction with bromine due to their carbon-carbon double bond, while alkanes do not.

11 (d)
A type of product made from alkenes is polymers (plastics).