When propane gas is bubbled into bromine water, no colour changes, why?

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SUMMARY

When propane gas is bubbled into bromine water, no color change occurs due to the chemical properties of alkanes. Alkanes, including propane, contain only single bonds, which render them relatively unreactive compared to alkenes that possess double bonds. This lack of reactivity prevents any reaction with bromine water, thus maintaining the original color of the bromine solution. The discussion confirms that the absence of color change is a characteristic behavior of alkanes in such reactions.

PREREQUISITES
  • Understanding of hydrocarbon families, specifically alkanes and alkenes.
  • Basic knowledge of chemical bonding, particularly single and double bonds.
  • Familiarity with the properties of bromine water as a reagent.
  • Knowledge of chemical reactivity and reaction mechanisms.
NEXT STEPS
  • Research the differences between alkanes and alkenes in terms of reactivity.
  • Study the mechanism of bromination reactions involving alkenes.
  • Explore the properties and uses of bromine water in organic chemistry.
  • Learn about other hydrocarbons and their reactions with halogens.
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Chemistry students, educators, and professionals interested in organic chemistry and the reactivity of hydrocarbons.

andyboy179
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hi,
i need to know why, when propane gas is bubbled into bromine water, no colour changes occurs?

if you could tell me i will be very grateful

thanks!
 
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Hi andyboy.What have you found out so far?
 
I have found out that no colour change occures when propane gas is bubbled into bromine water, but I'm not sure why
 
Do you know anything about hydrocarbon families such as alkanes and alkenes?
 
yes i know a bit about them
 
would it be because alkanes don't have any spare bonds?
 
You're on the right track.Alkanes have single bonds only and this makes them fairly unreactive when compared to,for example,alkenes.When an alkane such as methane or ethane or propane etc is added to bromine water there is no reaction and no colour change.
 
oh i understand now, thanks a lot!
 

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