Alkynes are hydrocarbons containing carbon-carbon triple bond. They exhibit neither geometric nor optical isomerism. The simplest alkyne is ethyne (HCCH), commonly known as acetylene.
Alkyl group is a type of functional group that has a carbon and hydrogen atom present in its structure. The general formula for an alkyl group is CnH2n+1. An alkyl substituent is an alkane missing one hydrogen.