Question $1(20$ marks$)$

Decide whether the following reactions are likely to proceed through S$\_($N$)1$ or S$\_($N$)2$ pathway and explain your

choice. $(8$ marks$)$ Assign the absolute configuration of A$,$ B and C $($ R or S $)$ showing clearly with priority

numbers how you have worked out your answer. $(6$ marks$)$ Draw the mechanisms for reactions $1$ and $2.$

$(6$ marks$)$