Order of writing halogens

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Betty Tesfaye 2G
Posts: 11
Joined: Fri Sep 25, 2015 3:00 am

Order of writing halogens

Postby Betty Tesfaye 2G » Thu Mar 03, 2016 2:45 pm

If you have more than one halogen attached to a carbon ring or chain how do you know which to give the lowest number and then how would you order that in the name?

Pauline Tran 2G
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: Order of writing halogens

Postby Pauline Tran 2G » Thu Mar 03, 2016 4:50 pm

You would first figure out all possible sets of numbers for the two halogens and then assign the lowest set of numbers to them. For example, in 5-chloro-2-iodoheptane, 5 and 2 is the lowest set of numbers, as the other possible set would be 3 and 6.

angelicapayne
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Re: Order of writing halogens

Postby angelicapayne » Mon Mar 13, 2017 4:07 pm

You would start numbering at the halogen that comes alphabetically first. For example if you had 1-bromo-3-chlorocyclohexane, because "b" comes before "c", you start numbering at the bromo and then go in the direction that gives the chloro the smallest number.

angelicapayne
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Re: Order of writing halogens

Postby angelicapayne » Mon Mar 13, 2017 4:11 pm

angelicapayne wrote:You would start numbering at the halogen that comes alphabetically first. For example if you had 1-bromo-3-chlorocyclohexane, because "b" comes before "c", you start numbering at the bromo and then go in the direction that gives the chloro the smallest number.


http://www.chemsink.com/compound/22760233/ here is a picture of the molecule


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