When wine is exposed to air it become sour due to:

oxidation of

C_{2} H_{5} O H

into

C H_{3} C O O H

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Solution

The correct option is A oxidation of $C_{2} H_{5} O H$ into $C H_{3} C O O H$
The oxidation of wine is perhaps the most common of wine faults, as the presence of oxygen and a catalyst are the only requirements for the process to occur.

Oxidation can occur throughout the wine making process and even after the wine has been bottled.

Option A is correct.

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