This reaction is most likely to fall under SN2 because the
thing called carbonication does not occur in SN1. The carbon forms a partial
bond with the nucleophile during the intermediate phase and the leaving group.
So for this question the reaction will fall under SN2.
No, because the appearance has nothing to do with system as well as the fact that appearance is only how it looks
(Btw, that toga picture is like... ughhhh!) hope this helps you ♥︎☀︎☁︎♨︎