Alkynes are _____ hydrocarbons
Hydrocarbons are made up of Carbon and Hydrogen atoms connected by a chemical bond.
The compounds containing Carbon atoms have multiple bonds between two Carbon-carbon atoms are called unsaturated hydrocarbons
Alkynes have Carbon-Carbon atoms connected through triple and single bond, Carbon-Hydrogen atoms that are only connected through single bonds.
So, Alkynes contain a triple bond between Carbon so they are unsaturated in nature.
Final answer:
Alkynes are unsaturated hydrocarbons