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Consider the following reaction and statements:
\[
\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Br}_{2}\right]^{+}+\mathrm{Br}^{-} \rightarrow\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Br}_{3}\right]+\mathrm{NH}_{3}
\]
I. Two isomers are produced if the reactant complex ion is a cis-isomer.
II. Two isomers are produced if the reactant complex ion is a trans-isomer.
III. Only one isomer is produced if the reactant complex ion is a trans-isomer.
IV. Only one isomer is produced if the reactant complex ion is a cis-isomer.
The correct statements are:
(a) (I) and (II)
(b) (I) and (III)
(c) (III) and (IV)
(d) (II) and (IV)
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