Which group in each pair is assigned the higher priority in R, S nomenclature?
`-CD_(3),-CH_(3)`

Explanation

To determine which group in the pair `-CD3` and `-CH3` is assigned the higher priority in R, S nomenclature, we can follow these steps:

### Step 1: Identify the Atoms in Each Group
- The first group is `-CD3`, which contains deuterium (D) and carbon (C).
- The second group is `-CH3`, which contains hydrogen (H) and carbon (C).

### Step 2: Compare the Atomic Numbers
- In R, S nomenclature, we assign priority based on the atomic number of the atoms directly attached to the chiral center.
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