`S_(N)2` reaction occurs with `"inversion of configuration" // "racemisation"`.

Explanation

To determine whether an \( S_N2 \) reaction occurs with "inversion of configuration" or "racemization," we can analyze the mechanism of the \( S_N2 \) reaction step by step.

### Step-by-Step Solution:

1. **Understanding \( S_N2 \) Reaction**:
- The \( S_N2 \) reaction is a bimolecular nucleophilic substitution reaction. It involves a nucleophile attacking an electrophilic carbon atom that is bonded to a leaving group.

2. **Mechanism of \( S_N2 \)**:
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