Does apple cider turn into alcohol if left in the fridge long enough?

Apple cider does not turn into alcohol on its own if left in the fridge long enough. Alcohol production from apple cider requires fermentation by yeast to convert the sugars in the cider into alcohol. To ferment apple cider and turn it into alcoholic apple cider, you need to introduce a source of yeast, like pitching yeast specifically used for this purpose. Leaving apple cider unfermented in the fridge does not initiate this process; therefore, it won't transform into alcohol naturally over time.