Give the structure and the IUPAC name of the lowest molecular mass aliphatic monocarboxylic acid containing a chiral carbon. Or write the structure of active valeric acid.

Explanation

To solve the problem, we need to identify the lowest molecular mass aliphatic monocarboxylic acid that contains a chiral carbon. We will also provide the structure and IUPAC name of active valeric acid.

### Step-by-step Solution:

1. **Understanding Monocarboxylic Acids**:
Monocarboxylic acids contain one carboxylic acid group (-COOH). The simplest aliphatic monocarboxylic acids are those with straight-chain carbon atoms.

2. **Identifying Chiral Carbon**:
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