Observe the following species $$ \mathrm{AlCl}_3, \mathrm{NH}_3, \mathrm{H}^{+}, \mathrm{Co}^{3+},-{ }^{-}…
Observe the following species
$$
\mathrm{AlCl}_3, \mathrm{NH}_3, \mathrm{H}^{+}, \mathrm{Co}^{3+},-{ }^{-} \mathrm{OH}, \mathrm{Mg}^{2+}, \mathrm{BF}_3, \mathrm{Cl}^{-}
$$
How many Lewis acids are present in the above list?
5
4
2
3
Solution
Lewis acids $=\mathrm{AlCl}_3, \mathrm{H}^{+}, \mathrm{Co}^{3+}, \mathrm{Mg}^{2+}, \mathrm{BF}_3$.