Which of the following gas causes rancidity in food product?

The correct answer is Option (1)-Oxygen

The gas that causes rancidity in food products is oxygen. When certain fats and oils in food are exposed to oxygen over time, they undergo oxidation, leading to the development of off-flavors and unpleasant odors, commonly known as rancidity. To prevent this, food products are often stored in airtight containers or packaging to minimize exposure to oxygen.