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11.1: Introduction to Alkynes

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  • The simplest alkyne—a hydrocarbon with carbon-to-carbon triple bond—has the molecular formula C2H2 and is known by its common name—acetylene. Its structure is H–C≡C–H.

    Terminal Alkyne: Internal Alkyne:

    CHEM11_A3_711.jpg CHEM11_A3_714.jpg

    3-chloro-1-propyne 4,4-dichloro-2-pentyne

    Bonding and Hybridization

    Bond Name Location Overlap
    Bond 1 s (? bond) bond Formed between 2 sp orbitals of carbon and hydrogen atoms End-on overlap
    Bond 2 S (? bond) bond Formed between the 2 sp orbital of 2 unsaturated Carbon atoms. End-on overlap
    Bond 3 p-bonds (? bonds) Formed between the 2 p-orbitals among the carbon atoms Side-on overlap

    Che 11B properties of alkynes image 2.bmp

    Che 118B Properties of Alkynes image 1.bmp

    Orbital Name


    Orbital 1 sp hybrid orbitals Formed in the linear structure model of carbon atom
    Orbital 2 p-orbitals Formed on each carbon


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