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Question:

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 isomer is produced if the reactant complex ion is a cis-isomer.
The correct statements are:

(III)and(IV)

(I)and(III)

(II)and(IV)

(I)and(II)

Solution:

From the given image it is clear that two isomers are produced if the reactant complexion is a cis-isomer, as well as only one isomer is produced if the reactant complex is a trans-isomer. Statement (I) and (III) are correct.