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For 1,2-cyclobutanediol, it's given in my book that it has 3 stereo isomers. Here's the passage:

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My questions:

  1. How can it have stereo-isomers?
  2. What will the meso compounds look like?
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These two isomers are enantiomers, i.e. mirror images, of each other:

$\hspace{50 mm}$Chiral

This one has a plane of symmetry through the molecule and is therefore meso:

$\hspace{60 mm}$Meso

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