THAT(!) blasted optical isomer question!!, Question 6, Paper 43, Oct/Nov 2013.

Please see/read the word document
about the question in the paper mentioned in the title..

tetrahedral-molecules-for-r-and-s

Also Zhao Xuan, at the end of the document I made a comment about the Lawsone (2-hydroxy-1,4-napthoquinone) question you asked.

Best wishes to ALL sitting paper 4 in one and a half day’s time

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