(R)-1-Bromo-1-chloroethane (CH₃CHBrCl) - R or S Configuration
Is (R)-1-Bromo-1-chloroethane R or S?
(R)-1-Bromo-1-chloroethane (CH₃CHBrCl) has 1 chiral center. Two different halogens on the same carbon. Priority is determined purely by atomic number: Br (35) > Cl (17) > C > H.. The configuration is R based on CIP priority rules.
| Formula | CH₃CHBrCl |
| Name | (R)-1-Bromo-1-chloroethane |
| Number of Chiral Centers | 1 |
| Configuration(s) | R |
| Difficulty | Beginner |
Chiral Center Analysis
(R)-1-Bromo-1-chloroethane (CH₃CHBrCl) contains 1 chiral center. Two different halogens on the same carbon. Priority is determined purely by atomic number: Br (35) > Cl (17) > C > H.. Each chiral center is analyzed below using CIP (Cahn-Ingold-Prelog) priority rules to determine R or S configuration.
CIP Priority Assignment
The four substituents on the chiral center are ranked by atomic number of the directly attached atom, with ties broken by exploring outward along each branch.
- Priority 1: Br - Bromine - highest atomic number (35)
- Priority 2: Cl - Chlorine - atomic number 17
- Priority 3: -CH₃ - Methyl group - carbon (atomic number 6)
- Priority 4: H - Hydrogen always lowest (atomic number 1)
R/S Configuration
With the lowest priority group (priority 4) oriented away from the viewer, the remaining three substituents trace a clockwise path from priority 1 to 2 to 3. This gives the R configuration.
Interactive stereochemistry explorer with guided walkthroughs and practice quizzes.
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