Hydroformylation of olefins yields

Explanation

### Step-by-Step Solution:

1. **Understanding the Terms**:
- Olefins are also known as alkenes, which are hydrocarbons that contain at least one carbon-carbon double bond (C=C).
- Hydroformylation is a chemical reaction that converts alkenes into aldehydes.

2. **The Hydroformylation Reaction**:
- The hydroformylation process involves the addition of carbon monoxide (CO) and hydrogen (H2) to an alkene.
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