Name a single hydrocarbon which increases the rate of fruit ripening.

Explanation

### Step-by-Step Solution:

1. **Identify the Hydrocarbon**: The question asks for a single hydrocarbon that increases the rate of fruit ripening.

2. **Recall the Relevant Hydrocarbon**: The hydrocarbon known for its role in fruit ripening is ethylene.

3. **Provide the IUPAC Name**: The IUPAC name of ethylene is ethene.

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