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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EASYWhich 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) $\left(\mathrm{CH}_3\right)_2 \mathrm{CHOH}+\mathrm{HCl} \xrightarrow{\text { anh. } \mathrm{ZnCl}_2}$
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:
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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