Ghee or clarified butter has it's characteristic smell which is usually quite aromatic, so if it smells foul or rancid it should be discarded.
No. It may kill any bacteria, but the butter will still smell and taste rancid.
The acid found in rancid butter is typically butyric acid. It gives off a strong, rancid smell and sour taste when butter goes bad.
Having a rank smell or taste, from chemical change or decomposition; musty; as, rancid oil or butter.
Having a rank smell or taste, from chemical change or decomposition; musty; as, rancid oil or butter.
Usually old (off) dairy products such as butter.
Slightly rancid.
The food that you baked with it will taste fairly grim. Start again?
Do you mean 'synthetic' butter? And by rancid do you mean it doesn't taste as good as cow's butter? If so, simply because synthetic butter is generally a mixture of oils, water and flavorings. Butter is made from cream which comes from cows.
Rancid oils taste bad, and contain free radicals, some of which are potentially carcinogenic. The potential for harm is low, however; eating rancid peanut butter probably won't result in a doctor or hospital visit.
Rancid butter contains butyric acid, which is responsible for the foul smell and taste associated with spoiled dairy products. Lactic acid and acetic acid may also be present in rancid butter as byproducts of bacterial fermentation.
Rancid
rancid