A. 2 C2H6+7 O2→4 CO2+6 H2O2 \mathrm{~C}_{2} \mathrm{H}_{6}+7 \mathrm{~O}_{2} \rightarrow 4 \mathrm{~CO}_{2}+6 \mathrm{~H}_{2} \mathrm{O}2 C2H6+7 O2→4 CO2+6 H2O
B. C2H6+Cl2→C2H5Cl+HCl\mathrm{C}_{2} \mathrm{H}_{6}+\mathrm{Cl}_{2} \rightarrow \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{Cl}+\mathrm{HCl}C2H6+Cl2→C2H5Cl+HCl
C. C2H6→2 C+3 H2\mathrm{C}_{2} \mathrm{H}_{6} \rightarrow 2 \mathrm{~C}+3 \mathrm{~H}_{2}C2H6→2 C+3 H2
D. C2H6→C2H4+H2\mathrm{C}_{2} \mathrm{H}_{6} \rightarrow \mathrm{C}_{2} \mathrm{H}_{4}+\mathrm{H}_{2}C2H6→C2H4+H2
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