How many molecules are planar from the following molecules?
$I_{3}^{-}, H_{2} O, I C l_{2}^{-}, C_{2} H_{4}, C_{2} H_{2}, H_{3} O^{+}$ ___

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Solution

How do we define a molecule to be planar?
Simply put, all the atoms shall lie on the same plane?
That is a workable definition. For instance, by definition,
tetrahedral molecules like methane, and pyramidal $H_{3} O^{+}$
cannot be planar! At the most 3 atoms can lie in a plane not 4!

The triiodide anion is linear. As is acetylene. The same logic
can be extended to $I C l_{2}^{-}$ . Water is bent but the three atoms
all lie on the same plane. Ethene is planar as well. 5!

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How many molecules have the same type of shape from the following molecules?
$H_{3} O^{+}, N H_{3}, C l O_{3}^{-}, P H_{3}, H_{2} O, ¯ C H_{3}$ ___

C O_{3}^{2 -}, N O_{3}^{-}, X e O_{4}, X e F_{4}, S F_{4}, I_{3}^{-}, C O C l_{2}, S O_{3}, I_{2} C l_{6} (solid)

C O_{3}^{2 -}, N O_{3}^{-}, X e O_{4}, X e F_{4}, S F_{4}, I_{3}^{-}, C O C l_{2}, S O_{3}, I_{2} C l_{6} (solid)

O C C l_{2}, C H_{3}^{+}, {C H_{3}}^{-}, C l F_{3}, {I_{3}}^{-}

S O_{2}, C O_{2}, N_{2} O, O F_{2}, {I C l_{2}}^{-}, {I_{3}}^{-}, N O_{2}, {N O_{2}}^{-}, {N O_{2}}^{+}, {B F_{2}}^{-}, B e C l_{2}, {N_{3}}^{-}, H C N .

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