good leaving group

[olygt]

For organic chemistry, is the more electronegative or least electronegative atom going to be least reactive? For instance: is (ch3)2CHCH2I or (CH3)2CHCH2Br least reactive towards an SN2 reaction. I know that if they are branched it's going to be least reactive and that primary is more reactive than secondary, etc. but these two are both branched and primary.

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[Manyak222]

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[Manyak222]

Cant believe no1 answered this poor man's question! U bastards. Anyways, the only thing here differing is the leaving groups. Remembering that I is a better LG than Br due to its more stable nature as an Ion, it undergoes sn2 at a faster rate. How fast you ask? I dont freakin know, man!
What I do know is when you go down the periodic table for the halogens, the ahlogen leaving groups become better. Thats all i have to say about that...

For organic chemistry, is the more electronegative or least electronegative atom going to be least reactive? For instance: is (ch3)2CHCH2I or (CH3)2CHCH2Br least reactive towards an SN2 reaction. I know that if they are branched it's going to be least reactive and that primary is more reactive than secondary, etc. but these two are both branched and primary.