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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
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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