a$.$

$k$

$4.$ Identify $($draw the structure$)$ the missing reagent, reactant, or major product required to complete the following transformations. PLEASE NOTE THE DIRECTION OF THE ARROWS.

$A$

$J$

$Os{O}_4/$ Pyridine

NaHS$\frac{O_3}{H_2}O$

I

$C$

$B\frac{H_3}{T}HF$

$H_2\frac{O_2}{{?}^{-}}OH$

G

$5.$ Provide a FULL Mechanism for the Reactions Shown Below.

a$.$