Problem: One of the two 2-butene stereoisomers reacts with Cl 2 to give a pair of 2,3-dichlorobutane enantiomers as a racemate. Is it cis or trans?

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One of the two 2-butene stereoisomers reacts with Cl 2 to give a pair of 2,3-dichlorobutane enantiomers as a racemate. Is it cis or trans?