Concerning Joyce's "Araby," I'm not exactly sure what you're asking. Your question is not really a question, and I have no idea what you mean by "a 16 marks question." I'll just comment on the disillusionment and frustration in the work.
The narrator is first frustrated by his infatuation with Mangan's sister, as any teenager might be. He likes her and is somewhat obsessed with her, but can't really get close to her or get to know her. Then when he finally gets a chance to cement a connection with her by getting her a gift from the bazaar, he's frustrated by having to wait for the day to arrive when he can go, and by his uncle returning home late to give him his spending money.
Once at the bazaar, he is then disillusioned by the appearance of the bazaar, the useless, trivial flirting of the three workers he overhears, and, apparently, by the items available for purchase.
He experiences an epiphany, then, when he realizes how trivial he has been during the course of his infatuation. Buying Mangan's sister a gift from Araby does not merit his total obsessiveness, which led him to neglect everything else.
The disillusionment and frustration in Araby is the sate of the unnamed boy at the end of the story when he stands all alone thinking his folly, his eyes, full of 'anguish' and 'anger' in the darkening corridor of the market, that is Araby.
It is not just a romantic disillusionment and frustration that the story renders, it is more of a philosophical one where the problematic borderline between illusion and reality is at stake.
Araby is about the impossibility of neurotic desire where the object of desire is always unreachable. Once reached, it does not remain the object that it was in fantasy. The boy curiously creates a mental Araby on which all his romantic energy regarding Mangan's sister is transferred and it is the overtly commercialized nature of the real Araby that belies his oriental and exotic fantasy about the ideal Araby.
Seen within the epiphanic paradigm, the experiences of disillusionment and frustration contribute to a maturing insight into the state of truth in life.