Final answer:
The Cahn-Ingold-Prelog (CIP) system ranks groups based on atomic numbers and multiple bonds, with higher atomic numbers giving higher priority. Specific group ranking requires details about the groups, which are not provided.
Step-by-step explanation:
To rank the groups in order of decreasing priority according to the Cahn-Ingold-Prelog (CIP) system, we follow the sequence rules that prioritize groups based on the atomic number (Z) of the atoms directly attached to the stereocenter. Without specific information about the groups (A, B, C, and D), you would need to know the atomic numbers of the atoms connected to the stereocenter or the presence of multiple bonded atoms. The general rule is that higher atomic numbers confer higher priority.
If we had details about the groups A to D, the answer could include an informed ranking based on specifics like atomic number or multiple bonds. However, since the details are not provided, we can cover the principle steps one would take:
- Identify the atoms directly attached to the stereocenter in each group (A, B, C, D).
- Rank the groups based on the atomic number of these atoms; higher atomic numbers mean higher priority.
- If there's a tie, look at the atoms bonded to these atoms and continue down the chain until a difference is found.
Without the atomic numbers or explicit structure of these groups, a specific ranking cannot be provided.