Q9 / 90 · KVPY 2019 (SB/SX) · Chemistry

For an octahedral complex MX4Y2 (M=a transition metal, X and Y are monodentate achiral ligands), the correct statement among the following is

  • A
    MX4Y2 has 2 geometrical isomers, one of which is chiral
  • Correct answer
    B
    MX4Y2 has 2 geometrical isomers both of which are achiral
  • C
    MX4Y2 has 4 geometrical isomers, all of which are achiral
  • D
    MX4Y2 has 4 geometrical isomers, two of which are chiral

Solution

Two geometrical isomers (cis and trans with respect to ligand Y) are possible. The trans isomer has both centre of symmetry and several planes of symmetry.

Figure

and, therefore it is achiral.

The cis isomer has two planes of symmetry and, therefore it is also achiral. 

Hence, the correct answer is option: 'B'.

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