Answer
1 - Cl
2 - (Right) C
3 - (Left) C
4 - H
Work Step by Step
1. Make a list with all atoms connected to the stereocenter, and rank them by atomic number.
- H, Cl, C, C.
By atomic number:
- Cl, C, C, H.
2. As we can see, there are 2 equal atoms, so we will have to find which one has the priority.
- We can do that by analyzing the atoms connected to them:
- To the left carbon: C, H, H.
- To the right carbon: Cl, H, H.
** Since there is a chloro on the right carbon, it will get priority.
** Cl > C (atomic number)
3. Now, put the numbers in order:
1 - Cl
2 - (Right) C
3 - (Left) C
4 - H