If ethane reacts with a large excess of chlorine over a long period of time, the most likely major product of the reaction would be:

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Quizplus · Accepted Answer

When ethane reacts with a large excess of chlorine, especially over a long period, it can lead to the substitution of all hydrogen atoms, resulting in C2Cl6 (hexachloroethane). This is because the reaction continues through multiple substitution steps until all hydrogen atoms are replaced by chlorine atoms.

If Ethane Reacts with a Large Excess of Chlorine Over