Question

Which of the following molecules are planar and have an angular geometry?

  • $\mathrm{ClO}_{3}^{+}$
  • $\mathrm{Cl}_{2} \mathrm{O}^{+}$
  • $\mathrm{H}_{3} \mathrm{O}^{+}$
  • $\mathrm{BF}_{2}^{-}$

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Answer

The molecules that are planar and have an angular geometry are:

  • $\mathrm{Cl}_{2}\mathrm{O}^{+}$
  • $\mathrm{BF}_{2}^{-}$

Let's analyze why these options are correct:

  1. $\mathrm{ClO}_{3}^{+}$ and $\mathrm{H}_{3}\mathrm{O}^{+}$:

    • These molecules have more than two ligands attached to the central atom.
    • Molecules with more than two ligands generally do not have a bent shape.
  2. $\mathrm{BF}_{2}^{-}$:

    • The neutral form of this molecule, $\mathrm{BF}_{3}$, has a trigonal planar structure.
    • Removing one $ \mathrm{F}^+ $ ion results in the $\mathrm{BF}_{2}^{-}$ ion, which adopts a bent shape, maintaining planarity.
  3. $\mathrm{Cl}_{2}\mathrm{O}^{+}$:

    • $\mathrm{Cl}_{2}\mathrm{O}$ itself is a bent molecule similar to water ( $\mathrm{H_{2}O}$ ) and hypochlorous acid ( $\mathrm{HOCl}$ ).
    • When one electron is removed from the central oxygen atom in dichlorine monoxide ( $\mathrm{Cl}{2}\mathrm{O}$ ), the resulting **$\mathrm{Cl}{2}\mathrm{O}^{+}$** ion remains bent and planar.

Thus, the molecules satisfying the conditions of being planar and angular in shape are:

  • $\mathrm{Cl}_{2}\mathrm{O}^{+}$
  • $\mathrm{BF}_{2}^{-}$

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