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Introduction

Alkynes are hydrocarbons that contain carbon-carbon triple bonds. The general formula of alkynes is CnH2n – 2.
 

image\Ch 17 sec A, g 1.png
 

In acetylene, the carbon is sp hybridized. The triple bond is composed of one sigma bond, and two pi bonds. The bond angle is 180o. We should also realize that the sigma bonds are formed by sp hybrid orbitals, and the pi bonds are formed by the p orbitals.

If the triple bond in an alkyne is at the end of a carbon chain, it is called a terminal alkyne. If the triple bond is not at the end of a carbon chain, it is called an internal alkyne.

 

image\Ch 17 sec A, g2.png





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