How many stereoisomers in #"2,4-dichloroheptane"#?

1 Answer
anor277
Sep 10, 2017

I counts four stereoisomers.......

Explanation:

You gots............

#H_3C-stackrel"*"CHClCH_2stackrel("*")CHClCH_2CH_2CH_3#

The starred carbons are of course chiral. And in this molecule, there should be #2^2=4# #"individual diastereomers"#, i.e. #"RR"#, #"RS"#, #"SR"#, and #"SS"#. And clearly, #"RR"#, and #"SS"# are enantiotopic non-superposable mirror images..........as are #"RS"#, and #"SR"#...........

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