Table sugar is 1/2 glucose and half fructose. An orange is 100% fructose. The medium of the pulp allows for slower absorption and the fiber does a number of things like simulating the intestinal walls.
In fact an orange is a mixture of glucose, fructose, and sucrose (which itself is glucose and fructose). An orange actually looks surprisingly like table sugar in terms of the sugar types, although you are correct that the pulp / fiber / etc do mean that the response of our body is likely different.
