A. Alkanes - All single bonds. e.g. Methane, Ethane, Propane, Butane etc.
B. Alkenes - At least one double bond. e.g. Methene, Ethene, Propene, Butene etc.
C. Alkynes - At least one triple bond. e.g. Methyne, Ethyne, Propyne, Butyne etc.
Option (C) Alkyne is true...