a$.$ Answer the following with reference to the Reactions and Structures shown below in Figure $7.$

$($i$)$ Provide the reagents necessary to complete the transformations shown in Reactions $1,2,3$ and $4.$ Note more than one step may be needed.

$($ii$)$ For Reaction $1$ with the help of a mechanism discuss the regiochemical outcome of the reaction.

$($iii$)$ For either Reaction $2$ or Reaction $3,$ with the help of a mechanism discuss the outcome of the reaction. As appropriate comment on any important regiochemical or stereochemical aspects of the reaction.

Reaction $2$

Reaction $1$

Reaction $3$

longrightarrow

Reaction $4$