Q13 / 125 · BITSAT 2021 · Chemistry

$\left[\mathrm{Fe}(\mathrm{en})_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right]^{2+}+$ en $\rightarrow$ complex $(\mathrm{X})$. The correct statement about the complex (X) is -

  • A
    it is a low spin complex
  • B
    it is diamagnetic
  • C
    it shows geometrical isomerism
  • Correct answer
    D
    (a) and (b) both

Solution

Complex $\mathrm{X}$ is $\left[\mathrm{Fe}(\mathrm{en})_{3} \mathrm{right}\right]^{2+} ;$ as 'en' is a strong field ligand pairing of electrons will take place. $\left[\mathrm{Fe}(\mathrm{en})_{3}\right]^{2+}$ : $d^{2} s p^{3}$ hybridisation Hence, hybridisation is $d^{2} s p^{3}$ and complex is diamagnetic. As it has 3 bidentate symmetrical 'en' ligands so it will not show geometrical isomerism.

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

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