00:01
So cis trans isomerism is also known as geometrical isomerism, and so we assign the substituent attached to the carbon -carbon double bond a priority.
00:11
And so if we have the two highest priority groups on the same face, then this is cis.
00:16
And if the two highest priority groups are on opposite phase, then this is trans.
00:20
And so if we do have two identical groups on the same carbon about the double bond, then we cannot have cystron's isomerism.
00:27
So with the first example, we can.
00:30
So we can start with the sixth.
00:32
While we have bromine on the same side.
00:45
This is the cis.
00:46
Alternatively, the trans.
00:48
What we need to do is switch to groups around on one side.
00:52
So now the bromines are opposite.
01:00
In the second example, we cannot have cis transisomerism because one of the carbons about the double bond have the exact same groups.
01:08
In part c, what we have is ch3, ch2, ic, double bond carbon, iodine, ch2, ch3...