Question

What is the main constituent of:
(i) petroleum gas?
(ii) natural gas?

Answer 1

1)
Liquefied petroleum gas is produced from petroleum. It consists of propane (C3H8) or butane (C4H10) or a mixture of both

2)
Natural gas is primarily composed of methane, but also contains ethane, propane and heavier hydrocarbons. It also contains small amounts of nitrogen, carbon dioxide, hydrogen sulphide and trace amounts of water.