The major process that occurs when sugar reacts with sulphuric acid is dehydration. This can simply be done by putting sugar in a glass container and probably dampen it with little water, then add sulphuric acid to it. An exothermic reaction occurs in such a way that water is removed from the sugar content and sulfur oxide fumes, steam, and heat are released instead.
An odor like that of caramel is produced aside from the smell of sulfur. The sugar pushes itself out of the glass container (such as beaker) while its white color changes to a black carbonized tube. The dehydration reaction that occurred is a kind of elimination reaction. Sugar is a carbohydrate, and when carbohydrates are being dehydrated (that is when water are removed from them), it remains only the carbon element. The water in the reaction mostly still remains as a liquid in the acid, while the remaining water is boiled off
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