Q112 · CSIR NET Chemistry, December 2014
Paper: CSIR NET December 2014 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Easy
The point group symmetries for trans-$\left[\mathrm{Cr}(\mathrm{en})_{2}\mathrm{F}_{2}\right]^{+}$ and $\left[\mathrm{TiCl}_{6}\right]^{3-}$, respectively, are
(a)$\mathrm{D}_{4 \mathrm{d}}$ and $\mathrm{D}_{3 \mathrm{d}}$
(b)$\mathrm{D}_{3 \mathrm{d}}$ and $\mathrm{D}_{4 \mathrm{d}}$
(c)$\mathrm{D}_{4 \mathrm{h}}$ and $\mathrm{D}_{3 \mathrm{h}}$
(d)$\mathrm{D}_{3 \mathrm{h}}$ and $\mathrm{D}_{4 \mathrm{h}}$
Answer
Answer: C ✓ checked by 4AB · confidence low
The source book printed no answer; this one was worked out and checked — see the explanation.
[TiCl6]3- is Oh; no option is fully correct.
Explanation
Treating the en rings as point ligands, trans-[Cr(en)₂F₂]⁺ is D₄h. [TiCl₆]³⁻ is a regular octahedron (O_h), which no option offers; (c) is the option with the correct D₄h. The printed question is defective.
Study loop for Organometallic Compounds