$a=$ Electrophilic addition

$b=$ E$2$ Elimination

$d=S_{N}2$ Nucleophilic substitution

$e=$ Electrophilic aromatic substitution

$c=S_{N}1$ Nucleophilic substitution

$f=$ Carbonyl nucleophilic addn

$g=$ Nucleophilic subs at carbonyl$($acyl Xfer$)$

$h=$ Conjugate $($nucleophilic$)$ addn

Identify the mechanism by which each of the reactions above proceeds from among the mechanisms listed. Use the letters $a-$i for your answers.

$1$

$2$