1mol乙烯(C2H4)与氯气完全加成后再与氯气取代，整个过程最多需氯气

1mol乙烯(C2H4)与氯气完全加成后再与氯气取代，整个过程最多需氯气（）

A．7mol　　 B．6mol　　C．5mol　 D．4mol

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1mol乙烯(C2H4)与氯气完全加成后再与氯气取代，整个过程最多需氯气

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