No it most certainly isnt, to break all the bonds in the glycerol you need to put in an enthalpy of +6974 and the energy released when the bonds reform is -5852, so you get less energy out then you put in so it wont burn.
Another example is the little finger of Mercury, which is the god of swift-thinking. But with all communicative skills and no truth, even a good god becomes a con artist. All the characteristics of each finger have both positive and negative aspects. Keep this in mind and be aware before putting a ring on a finger. Because the effects can be subtle at first, but they get worse over time. Characteristics of the five fingers The index finger-Jupiter
In Western countries yes it means the person is single. It could be a parent or relative or the person bought the ring themselves and it's for show so it goes on the middle finger or sometimes people wear 'pinkie rings' on their little finger.