Irony involving a situation in which actions have an effect that is opposite from what was intended, so that the outcome is contrary to what was expected.
"Why, hat do you think i'll have to go in?"
Mme. Loisel is dissatisfied with her place in society at the beginning of "The Necklace." In her efforts to pretend to be higher class by borrowing a beautiful necklace, she and her husband end up even lower in society.
Irony in which a person says or writes one thing and means another, or uses words to convey a meaning that is the opposite of the literal meaning.
"Oh, my poor Mathilde. But mine was fake. Why, at most it was worth only five hundred francs"
Mathilde doesn't really want her husband to give the invitation away, she is being sarcastic which is the most common form of verbal irony.
The main irony in the story is that the Loisels take on tremendous debt in order to replace an apparently expensive necklace that was actually a cheap imitation.