JEE Main 2018 Chemistry question

Consider the following reaction and statements :

[\mathrm{} + \mathrm{} → [\mathrm{}] + \mathrm{}

(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.

• (A)(I) and (II)
• (B)(I) and (III)Correct
• (C)(III) and (IV)
• (D)(II) and (IV)