00:01
This question asks us which of each pair of alkyl halides will be more reactive in an sn2 reaction.
00:07
So remember that sn2 reactions prefer primary leaving groups over secondary leaving groups.
00:13
So if we look at part a, this is a secondary bromine and this is a primary.
00:18
So because sn2's prefer primaries, this one over here will be more reactive.
00:24
For part b, we have the same compound, but just the leaving group has changed.
00:28
So chlorine versus bromine.
00:31
So if we think about leaving groups, remember that the weaker, the base, the better the leaving group it will be.
00:37
And so that also works if you go down the periodic table that becomes a weaker base and therefore a better leaving group.
00:44
So bromine is a weaker base than chlorine.
00:47
So it's a better leaving group.
00:48
So the two bromopropane will be more reactive.
00:53
For part c, now again, with an s &2 reaction, we prefer...