00:05
This question gives us some compound names and asks us to identify the ones that are named incorrectly and correct them.
00:12
So i think the easiest way to do this is to draw out each of these and then take a look at the name.
00:18
So four, ethel to pentine.
00:20
So if we have one, two, pentine, three, four has an ethel, five.
00:32
Oops, that should be three.
00:33
So if we look at this, the longest chain actually isn't five.
00:38
It's six like this.
00:41
So this should be one, two, three, four methyl to hexine.
00:52
B is one bromo for heptine.
00:56
So if we draw that out, one, this has a bromine on it, two, three, four has our alkan, that's five, six, six, seven.
01:15
So if we look at this one, we want the alkyne to be the lowest number that it can.
01:24
That takes precedence over the bromine.
01:27
So in that case, we actually want a number from this direction.
01:29
It'll be one, two, three, four, five, six, seven...