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Naming Simple Alkynes

Key Concepts

  • alkynes are hydrocarbons: made up of only carbon and hydrogen atoms

  • there is a triple bond between 2 carbon atoms

  • general formula: CnH2n-2

  • name ends in "yne"

  • prefix determined by the number of carbon atoms in the chain:
eth C2
prop C3
but C4
pent C5
hex C6
hept C7
oct C8
non C9
dec C10

Animated Tutorial

Examples

Name no. C atoms
(n)
no. H atoms
(2 x n) - 2
Formula Structure
ethyne 2 (2 x 2) - 2 = 2 C2H2

propyne 3 (2 x 3) - 2 = 4 C3H4

1-butyne 4 (2 x 4) - 2 = 6 C4H6

1-pentyne 5 (2 x 5) - 2 = 8 C5H8

1-hexyne 6 (2 x 6) - 2 = 10 C6H10

1-heptyne 7 (2 x 7) - 2 = 12 C7H12

1-octyne 8 (2 x 8) - 2 = 14 C8H14

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