Difference Between 1-Butyne and 2-Butyne | 1-Butyne vs 2-Butyne

Key Difference – 1-Butyne vs 2-Butyne

All simple aliphatic hydrocarbons are broadly categorized into three types based on the presence of carbon-carbon single or multiple bonds: alkanes, alkenes, and alkynes. Alkanes are saturated hydrocarbons and contain only single carbon-carbon bonds. The general formula of alkane is CnH2n+2. Some common alkanes include methane, ethane, propane, and butane. Alkenes are the unbranched unsaturated hydrocarbons with at least one carbon-carbon double bond. The general formula of alkene is CnH2n. The simplest alkene is ethylene. Butene, hexene, propene are some common examples for alkenes. Alkynes are the unsaturated hydrocarbons with at least one carbon-carbon triple bond. The general formula of alkyne is CnH2n-2. 1-butyne and 2-butyne are two simple alkynes that contain one carbon-carbon triple bond in different places. Both has the same molecular formula of C4H6, but have some differences. The key difference between 1-butyne and 2-butyne is that in 1-butyene, the triple bond is found between first and second carbon, whereas in 2-butyene, it is found between second and third carbon atoms. Because of this difference, these two substances have entirely different characteristic features.


1. Overview and Key Difference
2. What is 1-Butyne
3. What is 2-Butyne
4. Side by Side Comparison – 1-Butyne vs 2-Butyne in Tabular Form
5. Summary

What is 1-Butyne?

1-butyne is called a terminal alkyne due to the presence of terminal triple bond between the first and second carbon atoms of the carbon chain. Because of the presence of this terminal bond, 1-butyne can be distinguished from 2-butyene by two main tests. In the first test, ammoniacal cuprous chloride solution gives a red precipitate with 1-butyene, resulting in copper 1-butynide. In the second test, ammoniacal silver nitrate solution reacts with 1-butyne, resulting in silver 1-butynide, which is a white precipitate. Both these two solutions do not react with 2-butyne.