Question

Alkane and alkene may be distinguish chemically by using​

Answer 1

A simple test with bromine water can be used to tell the difference between an alkane and an alkene. An alkene will turn brown bromine water colourless as the bromine reacts with the carbon-carbon double bond. In fact this reaction will occur for unsaturated compounds containing carbon-carbon double bonds.

Answer 2

Answer:

Chemical tests which are used to distinguish the alkane and alkene is:

1:Using BAEYER’S REAGENT

2:WATER BROMINE TEST

1:USING BAEYER’S REAGENT:By using BAEYER reagent we can distinguish between the alkanes and alkene.

IN CASE OF ALKENE, 1% alkaline KMnO4 solution is used at low temperature .The PINK color of KMnO4 is discharged which show the unsaturaion in the molecules like alkene.

REACTION :

3H2C=CH2 + 2KMnO4 + 4H2O …COLD………

OH-CH2–CH2-OH + 2MnO2 + 2KOH

ETHYLENE GLYCOL IS PRODUCED.

2:BROMINE WATER TEST:(Addition of halogen )

When alkene react with halogen in the presence of inert solvent like CCl4 aat room temperature give vicinal dihalide.

REACTION:

H2C=CH2 + Br2……in the presence of CCl4……Br-CH2–CH2-Br

1,2-dibromoethane is produced.

ALKANES DO NOT GIVE ABOVE THE BOTH REACTION.THEREFORE,WE USE THIS TEST TO DISTINGUISH THE ALKANE AND ALKENE.