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In Stereochemistry of bromine addition to trans-Cinnamic acid lab we acquired a melting point of which...

In Stereochemistry of bromine addition to trans-Cinnamic acid lab we acquired a melting point of which matched erythro 2 3-dibromo-3-phenylpropanoic acid. Why was the product (or products) formed by anti- addition? explain. what evidence in the lab would help with explaining this? thank you!

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