(a) Isomers of propionic acid are as O O $\ \ \ \ \ \ \ \ \ \ \ \ \ \ \parallel \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \parallel$ $CH_{3} - C - OCH_{3}\ \ \ H - C - OC_{2}H_{5}$ methyl ethanoate ethyl formate
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