Question

For the following Sn2 reaction, draw the major organic product and select the correct (R) or (S) designation around the stereocenter carbon in the organic substrate and organic product. Include wedge/dash bonds and H on a stereocenter.

The correct (R) or (S) designations for the stereocenter carbons are: 

 The organic substrate and organic product are both (R).

 The organic substrate is (S) and the organic product is (R).

 Neither the organic substrate, nor the organic product has a stereocenter carbon atom.

 The organic substrate is (R) and the organic product is (S).

Answer 1

Correct:

To assign the R and S configuration, the compound should have chiral carbon i.e. carbon attached to four different groups.

In this example there is no chiral center and hence we can not assign R and S configuration. Only H and Br are different, remaining two groups have same linkage.