What is the molecular relationship between the pair of molecules below? CH3 CHO ?? ? ?? CH3 Select your answer from the drop down box below. Solution They are same / identical compounds. ------------------------------------------------------------------------------------------ Both compounds are same chemical (3-hydroxy-2-methylbutanal), represented differently by using fischer projection and newman formula. The left one is (2S,3S)-3-hydroxy-2-methylbutanal, the right one is also (2S,3S)-3-hydroxy-2-methylbutanal. So they are same compound or identical molecules. The priority order in assigning stereochemistry, OH > CC > CH3 > H, and CHO > CC > CH3 > H .

1. What is the molecular relationship between the pair of molecules below? CH3 CHO ?? ? ?? CH3
Select your answer from the drop down box below.
Solution
They are same / identical compounds.
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Both compounds are same chemical (3-hydroxy-2-methylbutanal), represented differently by
using fischer projection and newman formula.
The left one is (2S,3S)-3-hydroxy-2-methylbutanal, the right one is also (2S,3S)-3-hydroxy-2-
methylbutanal. So they are same compound or identical molecules. The priority order in
assigning stereochemistry, OH > CC > CH3 > H, and CHO > CC > CH3 > H