The ozonolysis product of an alkyne is 2-oxopentanal. Then the alkyne is___________

Explanation

To determine the alkyne from which the ozonolysis product is 2-oxopentanal, we can follow these steps:

### Step 1: Understand the ozonolysis reaction
Ozonolysis is a reaction where an alkene or alkyne reacts with ozone (O3) to form carbonyl compounds. In the case of alkynes, ozonolysis typically results in the formation of two carbonyl compounds.

### Step 2: Analyze the product
The product given is 2-oxopentanal. The name indicates that it is a five-carbon chain (pentanal) with a ketone (oxopentanal) at the second carbon. The structure can be represented as:
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