although the chemical structures of guaiacol and its derivatives are similar, they are not exactly the same…

although the chemical structures of guaiacol and its derivatives are similar, they are not exactly the same. the small differences in the derivatives chemical structures can have big effects on their flavors. because of this, guaiacol derivatives often smell and taste much different than guaiacol itself. for example, one common guaiacol derivative is vanillin. the chemical structure of vanillin is only slightly different from the chemical structure of guaiacol. however, this difference causes vanillin to have a vanilla flavor instead of a smoky flavor. the models below show the chemical structures of guaiacol and vanillin. which model has an outline around the part of vanillins chemical structure that is not part of guaiacols chemical structure?

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