(R)-2-Bromooctane reacts with hydrogen sulphide (`HS^(-)`) ion and gives (S)-2-octanethiol with inversion of configuration at the stereocentre. Can we plan to get (R)-2-octanethiol from (R)-2-bromooctane?

Explanation

To determine if we can obtain (R)-2-octanethiol from (R)-2-bromooctane, we need to analyze the reaction mechanism and the stereochemical implications of the substitution reactions involved.

### Step-by-Step Solution:

1. **Understanding the Initial Compound**:
- We start with (R)-2-bromooctane, which has a bromine atom attached to the second carbon of the octane chain. The configuration at this stereocenter is R.

2. **Reaction Mechanism**:
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