Chemistry / Chem 2448 · Atom · ~20 seconds
Alkynes: Linear Triple Bonds
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An alkyne contains a carbon-carbon triple bond, each sp-hybridized carbon linear, giving that portion a rigid 180° bond angle.
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Ethyne (acetylene) is fully linear because both its carbons are sp hybridized.
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A triple bond's extra pi bond makes it more reactive, not more stable — alkynes react even more readily than alkenes in addition.