Question

products of the alcohol dehydrogenase system include all of the following except
a h+ ions.
b acetaldehyde.
c fadh.
d nadh.

Explanation:

The alcohol - dehydrogenase system catalyzes the oxidation of alcohol to acetaldehyde. During this reaction, hydrogen ions ($H^+$) are released and $NAD^+$ is reduced to $NADH$. FADH is not a product of the alcohol - dehydrogenase system.

Answer:

C. FADH