Chemistry question - AS Level

[ictigcse2013]

What is the mechanism for the free radical substitution of ethane by chlorine?

I think the first would be breaking down Cl2 ( an ' is used to show a free radical)

Initiation: Cl2 -------> 2 Cl'

And then im not sure what the propagation and termination steps would be.

Any help would be great! Thank you!

 

[aniekan]

Check here . Download the summary and read it carefully

http://rgsinfo.net/subject/chemistry/as_a.htm

http://a-levelchemistry.co.uk/AQA Chemistry/AQA AS Chemistry/AS Chemistry home.htm

 

[Nisa Mirza]

Propagation results in more radicals being made. The highly reactive Cl' radical that has been initiated will react with a CH4 molecule forming H3C' radical and a HCl molecule. The H3C' can react with a Cl2 molecule forming CH3Cl and a Cl' radical. Inn short, whenever a radical is being made (apart from ofcourse in the homolytic fission of Cl2) to further 'attack' and cause reaction, we term the process propagation. Termination, on the other hand, is when 2 radicals react to form a compound. The Cl' radical and H3C' radical react to form the main product CH3Cl. Apart from HCl, a minute amount of C2H6 may also be made. Hope it helped.

 

[sweetiepie]

https://www.xtremepapers.com/community/threads/useful-compiled-stuff.13393/

 

[aniekan]

Cl2 -> 2Cl*

Propagation
C2H6 + Cl* ---> C2H5* + HCL
C2H5* + Cl2 --> C2H5Cl + Cl*

Termination
Cl* + Cl* --> Cl2
C2H5* + Cl* ---> C2H5Cl
C2H5* + C2H5* ---> C4H10

 

[ictigcse2013]

Thank you everybody, I get it now

 

[aniekan]

Thank you everybody, I get it now

Great!