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I wonder if ethyl ether can react with cold concentrated H2SO4. I think that it cannot react but I still not sure because my books don't say anything about temperature condition. What about heated concentrated H2SO4, can it react without water or alcohol just only conc. sulfuric acid. Thank you...

thanks for your answer. but the question use (R) isomer not a racemic.

When (R)-2-chlorobutane is chlorinated, we obtain some 2,3-dichlorobutane. It consists of 71% meso isomer and 29% racemic isomers. Explain why the mixture need not be 50:50 meso and (2R,3R)-2,3-dichlorobutane