Choose the correct statement(s) :

C a C_{2}

is formed by reacting

C a O

with coke in presence of heat.

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C a C_{2}

is formed by reaaction of

C a (O H)_{2}

with

C O

in presence of heat.

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Ethyne can be prepared from

C a C_{2}

by reacting it with

H_{2} O

in presence of heat

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Vicinal dihalides on treatmentwith alcoholic KOH undergo dehydrohalogenation.

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Solution

The correct options are
A $C a C_{2}$ is formed by reacting $C a O$ with coke in presence of heat.
C Ethyne can be prepared from $C a C_{2}$ by reacting it with $H_{2} O$ in presence of heat
D Vicinal dihalides on treatmentwith alcoholic KOH undergo dehydrohalogenation.
Preperation of $C a C_{2}$ :
$C a C O_{3} Δ ⟶ C a O + C O_{2}$
$C a O + 3 C C o k e Δ ⟶ C a C_{2} + C O$

Industrial method of preperation of ethyne :
$C a C_{2} + 2 H_{2} O Δ ⟶ C a (O H)_{2} + C_{2} H_{2} Ethyne$

Preperation of alkynes from vicinal dihalides :
Vicinal dihalides on treatment with alcoholic $K O H$ undergo dehydrohalogenation. One molecule of $H X$ is eliminated to form alkenyl halide which on treatment with sodamide gives alkyne.

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