Identify reagents that can be used to achieve the following transformation:

The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary

reagent$($s$)$ in the correct order, as a string of letters $($without spaces or punctuation, such as "EBF"$).$ If there is more than one

correct solution, provide just one answer.

A

$H_{2}O,H_{2}S{O}_4,HgS{O}_4$

D

$O_3$

DMS

B

$B{r}_2$

E

$H_2,$ Lindlar's catalyst

F

$R_{2}BH$

$H_2{O}_2,$NaOH

G