Distinguish between an alkane and an alkene on the basis of flame test.
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Answers
Dilute Baeyer's reagent by adding cold
More about Baeyer's Regnant.
Baeyer's reagent is cold diluted
It is an oxidizing agent.
If this mixture is added to unsaturated compounds such as alkenes or alkanes, then:
Purple color changes.
It first turns into a green compound that is unstable in an alkaline environment.
This will turn brown again
The supernatant becomes decolorized.
Simply put, your answer is:
To test for unsaturation, first, add cold diluted Baeyer's reagent.
If the reagent turns from purple to colorless, then the compound is unsaturated
Otherwise, if no reaction occurs, it is a saturated compound.
ALKELENES Properties:: 1) the first three alkenes, ethylene, propylene, and α-butylene, are gases. several other members are liquid. higher members are fixed.
2) except for ethylene, all other alkenes are colorless and odorless.
3) they are insoluble in water but quite soluble in organic solvents such as benzene, ether, chloroform, etc.
4) the boiling point of alkenes increases with increasing molecular weight. An increase of 20 to 30 degrees is observed for each carbon atom added.
5) as with alkanes, branched alkenes lower the boiling point.
Properties of ALKANES::
1)alkanes are colorless and odorless.
2) at room temperature, the first four alkanes ( C1. to C4 ) are gases, C5 to C17 are liquids, and higher alkanes C18 and beyond are solids.
3) ALKANES are insoluble in water but dissolve in non-polar solvents like benzene, ether, chloroform, etc.
4) branched-chain alkanes have a lower boiling point than straight-chain alkanes. As the branches in alkanes increase in size, the boiling point decreases because then the reduction in the surface area leads to weaker intermolecular forces.
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