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Question

Choose the correct statement(s) :

A
CaC2 is formed by reacting CaO with coke in presence of heat.
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B
CaC2 is formed by reaaction of Ca(OH)2 with CO in presence of heat.
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C
Ethyne can be prepared from CaC2 by reacting it with H2O in presence of heat
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D
Vicinal dihalides on treatmentwith alcoholic KOH undergo dehydrohalogenation.
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Solution

The correct option is D Vicinal dihalides on treatmentwith alcoholic KOH undergo dehydrohalogenation.
Preperation of CaC2 :
CaCO3ΔCaO+CO2
CaO+3CCokeΔCaC2+CO

Industrial method of preperation of ethyne :
CaC2+2H2OΔCa(OH)2+C2H2Ethyne

Preperation of alkynes from vicinal dihalides :
Vicinal dihalides on treatment with alcoholic KOH undergo dehydrohalogenation. One molecule of HX is eliminated to form alkenyl halide which on treatment with sodamide gives alkyne.




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