Questions asked by David A.

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• Does the Lewis Structure for #BrO_3^-# have three double bonds or two double bonds?
  
• What reagent should I use to complete the reaction? (Organic Chemistry 1)
  
• I am confused why cos (arccos 3π) has an answer of undefined. I see that arccos (cos 2π) is outside the range too, but you end up with arccos(cos 2π)=0? Why wouldn't the second one be undefined too?
  
• How do you determine the length of x in a right triangle when some of the information given is not part of the right triangle in question, but instead part of an outside acute angle? (Image included)
  
• What OH groups are axial in β-D-altropyranose? Having a lot of trouble drawing the compound in chair and boat conformation.