Is un bonbon correct in the french language?

No, "un bonbon" is not grammatically correct in French. It should be "un bonbon" (masculine singular noun).

The correct way to say "a candy" in French is "un bonbon".

Here are some examples:

* J'ai mangé un bonbon. (I ate a candy.)

* Peux-tu me donner un bonbon ? (Can you give me a candy?)

* Il y a beaucoup de bonbons dans le magasin. (There are many candies in the store.)