15) Starting with the model in number (14), remove a propyl alkyl group (-C3H7) from the end opposite the carboxylic acid functional group and replace it with a hydrogen. Then remove the hydrogen from the oxygen in the carboxylic acid functional group, and replace it with the propyl group that you just removed. You have just constructed the ester functional group, and you should be holding a model of propyl butanoate. Draw your model using expanded and line angle drawings in the boxes below. i R-C-O-R The ester functional group EXPANDED LINE ANGLE