Answer the following question given this paragraph: 

Unsaturated hydrocarbons that contain one or more triple bonds are called alkynes . The names of specific alkynes always end in –yne and have a prefix for the number of carbon atoms. The structural formula in the Figure below represents the smallest alkyne, named ethyne, which has two carbon atoms and two hydrogen atoms (C 2 H 2 ). Ethyne is also called acetylene. It is burned in acetylene torches, like the one pictured in the Figure below . The flame of an acetylene torch is so hot that it can melt metal.


Q: Alkynes are what type of compound?

 Choices:

- reversible hydrocarbons

- proteins hydrocarbons

- Split Hydrocarbons

- unsaturated hydrocarbons

A:
unsaturated hydrocarbons
