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    Preparation of Alkynes MCQ - Practice Questions with Answers

    Edited By admin | Updated on Sep 25, 2023 25:24 PM | #NEET

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    • 4 Questions around this concept.

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    QuestionEASY

    Which of the following reaction(s) can be used for the preparation of alkyl halides?
    (I) $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}+\mathrm{HCl} \xrightarrow{\text { anh. } \mathrm{ZnCl}_2}$
    (II) $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}+\mathrm{HCl} \rightarrow$
    (III) $\left(\mathrm{CH}_3\right)_3 \mathrm{COH}+\mathrm{HCl} \rightarrow$
    (IV) $\left(\mathrm{CH}_3\right)_2 \mathrm{CHOH}+\mathrm{HCl} \xrightarrow{\text { anh. } \mathrm{ZnCl}_2}$

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    Concepts Covered - 1

    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.

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    Preparation of Alkynes

    Study other Related Concepts

    Preparation of Alkynes Current Topic

    IUPAC Nomenclature of Alkanes
    Adsorption and Degree of Unsaturation
    Preparation of Alkanes
    Physical Properties of Alkanes
    Chemical Properties of Alkanes
    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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