Subject: Addition of bromine to ethyne

C-C double bonds and C-C triple bonds react quickly by addition. Ethene 
removes the colour from bromine water very quickly yet when I bubble ethyne 
through bromine water, the expected reaction doesn't happen. Any ideas why 
not?

When I make ethyne from calcium carbide and water, and bubble the gas through
bromine water, the orange/red colour does not fade quickly, yet when ethene
is used, it fades almost quickly. Theory tells me alkynes should undergo
addition reactions as quickly as alkenes.What is causing the difference ?

Response:

Re: Addition of bromine to ethyne
C-C double bonds and C-C triple bonds react quickly by addition. Ethene 
removes the colour from bromine water very quickly yet when I bubble ethyne 
through bromine water, the expected reaction doesn't happen. Any ideas why 
not?


_______________________________________________________________
Greetings George - Your question was not submitted to the 
MAD Scientist Network for the following reason:

We are unable to understand your question - what kind of experiment are you 
trying?  Could you please provide a more specific description of what you 
are dong?  Questions may be resubmitted via 
http://www.madsci.org/submit.html

Thanks fo rusing our site.

	Kieran Kelly, Admin MadSci Network
________________________________________________________________
MadSci Network
http://www.madsci.org/
webadmin@www.madsci.org

Re: Addition of bromine to ethyne