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

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Discussion Overview

The discussion centers around the observation that bubbling propane gas into bromine water does not result in any color change. Participants explore the underlying reasons for this phenomenon, focusing on the chemical properties of hydrocarbons, specifically alkanes.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the lack of color change when propane is bubbled into bromine water.
  • Another participant confirms the observation but expresses uncertainty about the reasons behind it.
  • A question is posed regarding knowledge of hydrocarbon families, suggesting a connection to the discussion.
  • It is proposed that the lack of color change may be due to alkanes not having any spare bonds.
  • A later reply supports this idea, explaining that alkanes have only single bonds, making them relatively unreactive compared to alkenes, which would react with bromine water.

Areas of Agreement / Disagreement

Participants generally agree on the observation that no color change occurs, and there is a shared understanding that the chemical structure of alkanes contributes to this lack of reactivity. However, the discussion does not reach a definitive conclusion on the specifics of the chemical interactions involved.

Contextual Notes

The discussion does not clarify the detailed mechanisms of why alkanes are unreactive in this context, nor does it explore the potential reactions of other hydrocarbon types, such as alkenes.

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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