Write down structure of the following compounds:
2-Butenedioic acid

Explanation

To write down the structure of 2-butenedioic acid, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Name and Components**:
- The name "2-butenedioic acid" indicates that the compound has a butene backbone (4 carbon atoms) and two carboxylic acid groups (-COOH) at the ends. The "2-" prefix indicates that there is a double bond between the second and third carbon atoms.

2. **Draw the Carbon Backbone**:
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