9 Men 1m
Micrest Form
ruww Tab
Identify the Lewis acid in the following reaction.
\[
\underset{\mathbf{I}}{\mathrm{Br}_{2}} \xrightarrow{\mathrm{FeBr}_{3}} \underset{\mathrm{II}}{\mathrm{FeBr}_{4}} \underset{\text { III }}{\ominus}+\underset{\mathrm{Br}}{\mathrm{IV}}
\]
A) I
B) II
C) III
D) IV
-
B
\( c \)
。