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    Preparation of Alkynes - Practice Questions & MCQ

    Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main

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    Preparation of Alkynes

    Calcium carbide: Ethyne is prepared by treating calcium carbide with water. Calcium carbide is prepared by heating quick lime with coke. Quick lime can be obtained by heating limestone as shown in the following reactions:

    \mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2}

    \mathrm{CaO}+3 \mathrm{C} \longrightarrow \mathrm{CaC}_{2}+\mathrm{CO}

    \mathrm{CaC}_{2}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{C}_{2} \mathrm{H}_{2}

    Vicinal dihalides: Vicinal dihalides on treatment with alcoholic potassium hydroxide undergo dehydrohalogenation. One molecule of hydrogen halide is eliminated to form alkenyl halide which on treatment with sodamide gives alkyne.

    Using Zinc: 

     Vicinal tetrahaloalkanes can be dehalogenated with zinc metal in an organometallic reaction to form alkynes.

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    Preparation of Alkynes

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    Preparation of Alkynes Current Topic

    IUPAC Nomenclature of Alkanes
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    Preparation of Alkanes
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    Conformation, Sawhorse and Newman Projections
    Nomenclature and Isomerism of Alkenes
    Preparation of Alkenes
    Chemical Properties of Alkenes
    Hydroboration and Oxidation

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    Preparation of Alkynes

    Chemistry Part II Textbook for Class XI

    Page No. : 393

    Line : 36

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