Unshared/lone pairs of valence electrons :)
1,3-cyclopentanediol has 3 possible stereoisomers. Two of which are enantiomers and are therefore, optically active, while one is optically inactive. The enantiomers are the <em>trans-</em> isomers which are (1R,3R)-1,3-Cyclopentanediol, and (1S,3S)-1,3- Cyclopentanediol.
The stereoisomer that is not optically active is the <em>cis- </em>isomer which is (1S,3R)-1,3-Cyclopentanediol and is shown in the illustration below.
Had to look for the options and here is my answer:
Based on the attached options, the one that is incorrectly paired is the THYME paired with "eases nausea". What makes this incorrect is that thyme is used ease the symptoms of cold and flu. The part of the thyme that is commonly used for medical use is its leaves. Hope this answers your question.