Question

give two tests to differentiate between alkanes and alkynes

Answer 1

combustion  alkanes  burns with a clear blue flame

                     alkyes burn with a yellow flame

oxidation       alkanes release carbon di oxide

                      alkynes release carbon mono oxide

Answer 2

Number 1 :

By adding bromine solution

Number 2 :

By adding Baeyer's reagnant .

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By adding  cold dilute Bromine solution

If this mixture is added to an unsaturated compounds such as alkenes or alkanes then :

• Bromine water is brown  

• The supernatant liquid gets decolourised.

However saturated compounds do not respond to the above test.

In order to test unsaturation first add bromine solution

If the reagnant decolorises from brown to colourless then the compound is unsaturated

Otherwise if the reaction does not occur , then it is a saturated compound.

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By adding  cold dilute Baeyer's reagnant

More about Baeyer's Reagnant.

• Baeyer's reagnant is cold dilute

• It is an oxidising agent.

If this mixture is added to an unsaturated compounds such as alkenes or alkanes then :

• Purple colour of  changes .

• It is first converted to a green compound   which is unstable in alkaline medium.

• This again changes to brown  

• The supernatant liquid gets decolourised.

However saturated compounds do not respond to the above test.

In simple words........... your answer is :

In order to test unsaturation first add cold dilute Baeyer's reagnant.

If the reagnant decolorises from purple to colourless then the compound is unsaturated

Otherwise if the reaction does not occur , then it is a saturated compound.

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