Give two chemical tests to distinguish between ethane and ethyne.

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Solution

Chemical tests done to distinguish between ethane and ethyne are:

Chemical Test Reagent Ethyne Ethane

Bromine Water Test Bromine water The orange colour of bromine goes away and it decolourises. No change

Baeyer's Test Alkaline (KMnO₄₎ The purple colour of KMnO₄ goes away and it decolourises. No change

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1)- Give a chemical test to distinguish between: Ethene gas and Ethane gas.

2)- Identify the gas evolved when: Sodium propionate is heated with soda lime.

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Chemical Test	Reagent	Ethyne	Ethane
Bromine Water Test	Bromine water	The orange colour of bromine goes away and it decolourises.	No change
Baeyer's Test	Alkaline (KMnO₄₎	The purple colour of KMnO₄ goes away and it decolourises.	No change