20. Refer to Exhlbit 4-2.(cH:):c TfwtrExhibit4.3 v (f$,c?+l) =L(lt,'/):-r$J= )(r,il= YJ/AI',The following question(s) refer to the sfucture of camphor shown below.H:CL,fu'\*l eil6?'sZl. Referto Exhibit 4-3. Circle all bridgehead carbons in camphor.72. Below are the two chair conformations of a 1,2,4-trimethylcyclohexane.strain in each conformer and predict which conformer is most stable.Estimate the amount of l,3diaxial*-cHr23. In general, S-ailqyl substituents in l,3-dioxane exhibit a smaller equatorial preference
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