• Al4C3→ CH4 → CH3CI → C2H6 → C2H4

The sequence you've provided appears to represent a series of chemical transformations or reactions, transitioning from aluminum carbide (Al₄C₃) to ethylene (C₂H₄). Let’s break this down step-by-step:

1. Aluminum Carbide to Methane:

   • Aluminum carbide (Al₄C₃) reacts with water or steam to produce methane (CH₄) and aluminum hydroxide. \[ \text{Al}_4\text{C}_3 + 12 \text{H}_2\text{O} \rightarrow 3 \text{CH}_4 + 4 \text{Al(OH)}_3 \]

2. Methane to Methyl Chloride:

   • Methane (CH₄) can be halogenated to form methyl chloride (CH₃Cl) through a reaction with chlorine (Cl₂) in the presence of light or heat (free radical halogenation). \[ \text{CH}_4 + \text{Cl}_2 \xrightarrow{hv} \text{CH}_3\text{Cl} + \text{HCl} \]

3. Methyl Chloride to Ethane:

   • Methyl chloride can undergo further substitution or coupling reactions to form ethane (C₂H₆). One common method involves reaction with another methyl halide or through a Wurtz reaction. \[ 2 \text{CH}_3\text{Cl} + 2 \text{Na} \rightarrow \text{C}_2\text{H}_6 + 2 \text{NaCl} \]

4. Ethane to Ethylene:

   • Ethane (C₂H₆) can be dehydrogenated to produce ethylene (C₂H₄). This can be achieved through heating with a catalyst or through high temperatures. \[ \text{C}_2\text{H}_6 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2 \]

Overall Transformation

So the overall transformation can be summarized as follows:

1. Al₄C₃ → CH₄
2. CH₄ → CH₃Cl
3. CH₃Cl → C₂H₆
4. C₂H₆ → C₂H₄

If you have any specific questions about any of the reactions or need clarification on certain concepts, feel free to ask!