Write down the bond line structure of the following:
Cis-(or Z-) 2-butene

Explanation

To draw the bond line structure of cis-2-butene, follow these steps:

### Step-by-Step Solution:

1. **Identify the Parent Chain**:
- The name "2-butene" indicates that the parent chain contains four carbon atoms (but-), and there is a double bond at the second carbon (2-).

2. **Draw the Carbon Backbone**:
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