Identify the compounds in Figure $3$ that are an ester, an acyl bromide, and an

anhydridea. $($i$)$ Identify the compounds in Figure $3$ that are an ester, an acyl bromide, and an

anhydride.

$($ii$)$ Place the Figure $3$ compounds in order based on their relative reactivities in a

nucleophilic addition reaction and explain your answer by considering the

approximate pKa values for the conjugate acids of the potential leaving groups.