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Coordination Compounds question

2020 · 9 Jan · Shift 2 · Q12
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Coordination Compounds question

2020 · 9 Jan · Shift 2 · Q12

JEE MainChemistryCoordination CompoundsMCQ+4 / −1
The isomer(s) of [Co(NH3)4Cl2][Co(NH_3)_4Cl_2][Co(NH3​)4​Cl2​] that has/have a ClClCl–CoCoCo–ClClCl angle of 90°, is/are :
  1. A
    cis only
  2. B
    cis and trans
  3. C
    meridional and trans
  4. D
    trans only
View written solutionFree

Correct answer: A

  1. Identify the complex and its geometry

The complex is [Co(NH3)4Cl2].[Co(NH_3)_4Cl_2].[Co(NH3​)4​Cl2​].

Since the coordination number is 666, the geometry is octahedral.

So the two possible geometrical isomers are:

  • cis
  • trans

There is no possibility of meridional here, because mer/fac terminology applies to complexes of type MA3B3MA_3B_3MA3​B3​, not MA4B2MA_4B_2MA4​B2​.

  1. Understand the meaning of ClClCl–CoCoCo–ClClCl angle

This is the angle between the two Co−ClCo-ClCo−Cl bonds in the octahedral complex.

In an octahedral geometry:

  • adjacent positions make an angle of 90∘90^\circ90∘
  • opposite positions make an angle of 180∘180^\circ180∘
  1. Check the cis isomer

In the cis isomer, the two ClClCl ligands are adjacent to each other.

Therefore, ∠Cl−Co−Cl=90∘.\angle Cl-Co-Cl = 90^\circ.∠Cl−Co−Cl=90∘.

So cis satisfies the condition.

  1. Check the trans isomer

In the trans isomer, the two ClClCl ligands are opposite to each other.

Therefore, ∠Cl−Co−Cl=180∘.\angle Cl-Co-Cl = 180^\circ.∠Cl−Co−Cl=180∘.

So trans does not satisfy the condition.

  1. Evaluate the options
  • A: cis only → Correct
  • B: cis and trans → Incorrect
  • C: meridional and trans → Incorrect, meridional not applicable here
  • D: trans only → Incorrect
  1. Final answer

The isomer having ClClCl–CoCoCo–ClClCl angle equal to 90∘90^\circ90∘ is: cis only\boxed{\text{cis only}}cis only​

So the correct option is A.

  1. Comparison with stored correct answer

Stored correct answer: A

My derived answer: A

They agree.

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