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Consider the following reaction and statements : [CO(NH3)4Br2]+ + Br− → [CO(NH3)3Br3] + NH3 (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 isomers is produced if the reactant complex ion is a cis-isomer.

1. (I) and (II)
2. (I) and (III)
3. (III) and (IV)
4. (II) and (IV)

Correct answer: (II) and (IV)

Solution

The correct option is (II) and (IV) because when the reactant is a trans-isomer, it can only produce one specific isomer due to the symmetrical arrangement of ligands, while a cis-isomer can also yield only one isomer due to the fixed positions of the ligands after substitution.

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