Assertion : Glyceraldehyde reacts with `Br_(2)//H_(2)O` to form achiral compound
Reason : `-CHO` and `-CH_(2)OH` both are oxidized

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that glyceraldehyde reacts with `Br2/H2O` to form an achiral compound.
- Glyceraldehyde (C3H6O3) has the structure:
```
CHO
|
CH2OH
|
CH3
```
- When glyceraldehyde reacts with bromine water, it undergoes oxidation.

2. **Reaction with Bromine Water**:
- In the presence of `Br2/H2O`, the aldehyde group (-CHO) of glyceraldehyde is oxidized to a carboxylic acid group (-COOH).
- The reaction can be summarized as:
```
Glyceraldehyde → Gluconic Acid (C6H12O7)
```
- The structure of gluconic acid is:
```
HOOC-CHOH-CHOH-CHOH-CHOH-CHOH
```
- This compound is achiral because it has a plane of symmetry.

3. **Understanding the Reason**:
- The reason states that both the -CHO (aldehyde) and -CH2OH (alcohol) groups are oxidized.
- However, in the reaction with bromine water, only the aldehyde group (-CHO) is oxidized to a carboxylic acid. The alcohol group (-CH2OH) does not undergo oxidation under these conditions.

4. **Conclusion**:
- The assertion is true because glyceraldehyde does react with `Br2/H2O` to form an achiral compound (gluconic acid).
- The reason is false because only the aldehyde group is oxidized, not the alcohol group.

### Final Answer:
- The assertion is true, and the reason is false.