Structural formulas & optical activity

In summary, a structural formula is a graphical representation of a molecule's arrangement of atoms and bonds, providing information about its chemical structure. It differs from a molecular formula, which only shows the number and type of atoms. Optical activity, determined by a molecule's structural formula, refers to its ability to rotate polarized light. The direction of rotation is determined by the spatial arrangement of substituent groups. A molecule can only have one type of optical activity, either positive or negative, depending on its chiral or achiral structure.
  • #1
Homework Statement
Which of the following compounds is not optically active?
Relevant Equations
N/A
89349175_205983014097940_4022541854036721664_n.jpg

How do I determine which group is dash (into the page) and which is wedge (out of page)?
Won't that literally change which isomer it is?
How to determine optical activity then?
(I believe that in order for something to be optically active it has to be an enantiomer--a non-superimposable mirror image; therefore, I need to determine which of the four compounds don't fit that description.)

<<The textbook's answer is B because it is a meso compound.>>Thank you all for your consideration and help!
 
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  • #2
Google Fischer projection.
 

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