Ethanol is a fuel used in cars. It can be made from petroleum.
${C_4}{H_{10}} \to {C_2}{H_4} + {C_2}{H_6}$ cracking
${C_2}{H_4} + {H_2}O \to {C_2}{H_5}OH$ producing ethanol
${C_2}{H_5}OH + 3{O_2} \to 2C{O_2} + 3{H_2}O$ burning
Compounds of how many homologous series appear in these equations?
1 )
1
2 )
2
3
4 )
4
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