If you exercise strenuously without sufficient oxygen, lactic acid accumulates and contributes to muscle fatigue and soreness. When oxygen is later available, lactic acid must be oxidized to pyruvic acid (see below): [O] lactic acid pyruvic acid (a) Circle the alcohol functional group. Classify the alcohol as primary, secondary, or tertiary. (b) Complete the reaction equation above. Draw the structure formula of the reaction product, pyruvic acid.