Which formula represents an alkyne?
(1) CnHn
(2) CnH2n + 2
(3) C2nHn
(4) CnH2n – 2
Alkynes are a group of organic molecules that have a triple bond. The formula for alkynes is CnH2n-2, making choice 4 the correct choice. The formula for alkanes (all single bonds) is CnH2n+2, and that for alkenes (molecules that have a double bond) is CnH2n. Alkenes as well as alkynes are unsaturated hydrocarbons, while alkanes are saturated hydrocarbons.
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