Q7 of 312 Page 262

Explain why, ethene decolourises bromine water whereas ethane does not.

Ethene is an unsaturated hydrocarbon, hence it can decolourises the bromine water whereas ethane is a saturated hydrocarbon, hence it cannot do.

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5 Why does ethyne (acetylene) burn with a sooty flame? 6 Name the product formed when hydrogen is added to ethene. 8 Name two catalysts which can be used in the hydrogenation of unsaturated compounds. 9 State two disadvantages of incomplete combustion.