a) \(CaCO_{3} \overset{t°}{\rightarrow} CaO + CO_{2}\)
\(CaO + 3C \overset{t°}{\rightarrow} CaC_{2} + CO\)
\(CaC_{2} + 2H_{2}O \rightarrow Ca(OH)_{2} + C_{2}H_{2}\)
b) \(2CH_{4} \overset{1500°C/LLN}{\rightarrow} C_{2}H_{2} + 3H_{2}\)
\(2C_{2}H{2} \overset{xt}{\rightarrow} CH \equiv C - CH = CH_{2}\)
\(CH \equiv C - CH = CH_{2} + H_{2} \overset{PbCO_{3}, t°}{\rightarrow} CH_{2} = CH - CH = CH_{2}\)
\(nCH_{2}= CH - CH= CH_{2} \overset{xt, t°}{\rightarrow} (-CH_{2} - CH = CH - CH_{2}-)_{n}\)
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