19.(b) diastereomers Reason: In case of 2,3-dibromobutane, both stereogenic carb

Question

19.(b) diastereomers

Reason: In case of 2,3-dibromobutane, both stereogenic carbons have a H, a Br, a methyl, and a 1-bromoethyl substituent. The maximum of four stereoisomers is not observed here, as we saw before. In fact there are three stereoisomers, including one achiral stereoisomer. This is because the 2R,3S molecule is identical to the 2S,3R molecule, since carbons 2 and 3 are equivalent

20.  Meso compounds are achiral compounds that has multiple chiral centers. It is superimposed on its mirror image and is optically inactive despite its stereocenters.

so ans is option (e) both 2 and 3

These molecules have a plane of symmetry and, therefore, is achiral; However, it has two chiral carbons and is consequentially a meso compound.

Explanation / Answer

19. Give the relationship between the following two compounds. HC a. Enantiomers b. Diastereomers c. Constitutional isomers d. Conformers e. Unrelated 20. Which of the following compounds is/are meso compound(s)? cl a. CHs d. 4 e. Both 2 and 3 b. 2

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