Verified Solution • 2025–26 Session moderate

QJEEM18Ch43c2: JEE Main 2018 Chemistry - Class 12 JEEM18Ch43c2 Solution: Consider the following reaction and statements: [Co(NH 3 ) 4 Br …

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

Multiple Choice Options

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

Step-by-Step Verified Solution

When reactant is cis isomer then following reaction takes place.

JEE Main 2018 (Offline) Chemistry - Coordination Compounds Question 255 English Explanation 1
So, if reactant is cis - isomer then two isomers are produced.

When reactant is trans isomer then following reaction takes place.

JEE Main 2018 (Offline) Chemistry - Coordination Compounds Question 255 English Explanation 2

So, if the reactant is trans isomer then only one isomer is produced.

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