Answer :

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...

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