Write the structural formula of: 2-chloro-3-hydroxybutanal.

Explanation

To write the structural formula of 2-chloro-3-hydroxybutanal, we will follow these steps:

### Step 1: Identify the Carbon Chain
Since the name of the compound is butanal, it indicates that we have a four-carbon chain (but-). The aldehyde functional group (-CHO) is present at the first carbon.

**Hint:** Remember that "but" refers to a four-carbon chain.

### Step 2: Draw the Carbon Backbone
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