Which group in each pair is assigned the higher priority in R, S nomenclature?
`-OH,-NH_(2)`

Explanation

To determine which group in the pair `-OH` (hydroxyl group) and `-NH2` (amino group) is assigned the higher priority in R, S nomenclature, we will follow the Cahn-Ingold-Prelog (CIP) priority rules. Here’s a step-by-step solution:

### Step 1: Identify the first atom in each group
- For the hydroxyl group `-OH`, the first atom is oxygen (O).
- For the amino group `-NH2`, the first atom is nitrogen (N).

### Step 2: Determine the atomic numbers of the first atoms
- The atomic number of oxygen (O) is 8.
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