Among the following, the alkene on ozonolysis gives rise to only one aldehyde as the product, is:

• A. 1-butyne
• B. Prop-1-ene
• C. 2-butene
• D. 2-methyl-prop-1-ene

To determine which alkene produces only one aldehyde upon ozonolysis, we need to analyze the options provided.

Understanding Ozonolysis

Ozonolysis is a reaction where alkenes react with ozone (O₃) to form carbonyl compounds, typically aldehydes or ketones. The structure of the alkene influences the products formed.

Analyzing the Options

• A. 1-butyne: This is an alkyne, not an alkene, so it doesn't apply.
• B. Prop-1-ene: This will yield two different aldehydes upon ozonolysis.
• C. 2-butene: This can produce two aldehydes due to its symmetrical structure.
• D. 2-methyl-prop-1-ene: This alkene will yield only one aldehyde upon ozonolysis.

Final Answer

The correct choice is D. 2-methyl-prop-1-ene, as it results in only one aldehyde after ozonolysis.