00:01
Hi, in this question we are given with these four structures and we are asked to select those structures which are representing the same stereoisomers.
00:08
We can say that stereoisomers are those which are having the same molecular formula but they are having different orientation in space.
00:29
We have to find out the rs configuration from which we can identify which are representing the same stereoisomer.
00:36
According to cip rule we have to give priority to the groups which are attached to this carbon atom.
00:43
Highest priority will be given to this oh group, second priority will be given to this ch2br, third priority will be given to ch3 and fourth priority will be given to hydrogen.
00:56
Now we have to move our eye according to the numbering.
01:00
We can see we are moving in this way as 1, 2, 3.
01:05
We can ignore the fourth, we can move in this way and this is anti -clockwise manner.
01:13
But here we can see the lowest priority is at the fourth, therefore we have to change the configuration.
01:20
For anti -clockwise we say s configuration and we have to convert it into r.
01:27
Therefore we can say that the first structure is having the r configuration.
01:32
Similarly let us check for the second.
01:34
We can write 1, 3 and 4...