Ca + C xrightarrow[Delta ]{} A xrightarrow{H_ | vedclass

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(B) $1$. The reaction of calcium with carbon at high temperature $(\Delta)$ produces calcium carbide: $Ca   2C \xrightarrow{\Delta} CaC_2 (A)$.$2$. Ca

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$C_2H_2$ and Benzene

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(B) $1$. The reaction of calcium with carbon at high temperature $(\Delta)$ produces calcium carbide: $Ca   2C \xrightarrow{\Delta} CaC_2 (A)$.$2$. Calcium carbide reacts with water to produce ethyne (acetylene): $CaC_2   2H_2O ightarrow Ca(OH)_2   C_2H_2 (B)$.$3$. Ethyne undergoes cyclic polymerization (trimerization) when passed through a red-hot iron tube at $873 \ K$ to form benzene: $3C_2H_2 \xrightarrow{	ext{red hot Fe tube}} C_6H_6 (C)$.$4$. Thus,$B$ is $C_2H_2$ and $C$ is Benzene.

$Ca + C$ $\xrightarrow[\Delta ]{} A$ $\xrightarrow{H_2O} B$ $\xrightarrow{\text{cyclic polymerisation}} C$
Product $B$ and $C$ are respectively

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$Ca + C$ $\xrightarrow[\Delta ]{} A$ $\xrightarrow{H_2O} B$ $\xrightarrow{\text{cyclic polymerisation}} C$ Product $B$ and $C$ are respectively