A)I B) II and III C) III and IV D) II and IV E) IV only I tried this two ways. T

Question

A)I

B) II and III

C) III and IV

D) II and IV

E) IV only

I tried this two ways. The first way was determine the R/S config of each and I found that only II had the same config. Which is not a choice.

I then tried drawing the saw horse drawing and found that only IV seemed to have a plane of symmetry. Which would work and maybe I did the R/S wrong.

Which of the compounds (I-IV) is(are) a meso compound? A)I B) II and III C) III and IV D) II and IV E) IV only I tried this two ways. The first way was determine the R/S config of each and I found that only II had the same config. Which is not a choice. I then tried drawing the saw horse drawing and found that only IV seemed to have a plane of symmetry. Which would work and maybe I did the R/S wrong.

Explanation / Answer

E) IV only

Compound -IV has R,S-configuration, so that half part optical rotation is compensated by the other half part, therfore net rotation is zero. This is called internal compensation.

Compound -II has S,S-configuration

compound-III has R,R-configuration

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