Identify the product when one equivalent of HBr reacts with 1-pentene-4-yne

Explanation

To determine the product of the reaction between 1-pentene-4-yne and one equivalent of HBr, we will follow these steps:

### Step 1: Understand the Structure of 1-Pentene-4-yne
1. **Identify the structure**: 1-pentene-4-yne has a total of 5 carbon atoms. The "1-pentene" indicates a double bond at the first carbon, and "4-yne" indicates a triple bond at the fourth carbon.
- Structure:
```
CH2=CH-CH2-C≡C-H
```
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