Any chemistry substance can be classified as an acid or base by making use of Lewis mountain base theory. Further,the acidic and basic nature of the substance deserve to be analyzed with the ability of molecules to accept and also donate electrons.

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Fundamentals

According come Lewis mountain -base theory, An mountain is a substance that accepts a pair of electrons. A basic is a substance that donates a pair the electrons.

The given molecules are \$$\\mathrmCO_2, \\mathrmP\\left(\\mathrmCH_3\\right)_3, \\mathrmH_2 \\mathrmO,\$$ and \$$\\mathrmB\\left(\\mathrmCH_3\\right)_3\$$

\$$\\mathrmCO_2\$$ is the electron pair acceptor. \$$\\mathrmP\\left(\\mathrmCH_3\\right)_3\$$ is the electron pair donor. \$$\\mathrmH_2 \\mathrmO\$$ deserve to act together both electron pair acceptor and donor. \$$\\mathrmB\\left(\\mathrmCH_3\\right)_3\$$ is the electron pair acceptor

In \$$\\mathrmCO_2\$$ the central atom Carbon is electron deficient since two oxygen atoms (more electronegative than carbon) pull the bonding pair electron in the direction of itself. Thus, the carbon dioxide acts as electron pair acceptor and also it is a Lewis acid. In \$$\\mathrmP\\left(\\mathrmCH_3\\right)_3\$$ the central atom has actually one unpaired electron and it can act together an electron pair donor. So it is a Lewis base. As soon as \$$\\mathrmH_2 \\mathrmO\$$ ionizes, it develops both \$$\\mathrmH^+\$$ and also \$$\\mathrmOH^-\$$. The proton \$$\\left(\\mathrmH^+\\right)\$$ have the right to accept a pair the electrons and also so the is a Lewis acid. The hydroxide ion \$$\\left(\\mathrmOH^-\\right)\$$ deserve to donate a pair of electrons and so that is a Lewis base. Hence \$$\\mathrmH_2 \\mathrmO\$$ molecule deserve to acts as both Lewis acid and base.

In \$$\\mathrmB\\left(\\mathrmCH_3\\right)_3\$$ the central atom boron (B) has actually vacant d orbital to accept a pair the electrons and also so it can act together a Lewis base.

The given molecules space \$$\\mathrmFe^3+, \\mathrmCN^-, \\mathrmOH^-, \\mathrmH^+\$$

\$$\\mathrmFe^3+\$$ is the electron pair acceptor. \$$\\mathrmCN^-\$$ is the electron pair donor. \$$\\mathrmOH^-\$$ is the electron pair donor. \$$\\mathrmH^+\$$ is the electron pair acceptor.

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The molecule that are Lewis acids space \$$\\mathrmCO_2, \\mathrmH^+, \\mathrmH_2 \\mathrmO, \\mathrmFe^3+\$$ and also \$$\\mathrmB\\left(\\mathrmCH_3\\right)_3\$$

The molecule that are Lewis bases space \$$\\mathrmOH^-, \\mathrmCN^- \\mathrmH_2 \\mathrmO\$$ and \$$\\mathrmP\\left(\\mathrmCH_3\\right)_3\$$

\$$\\mathrmFe^3+\$$ is a positive charged types (cation). The accepts a pair of electron to come to be neutral (Fe) atom. So the is a Lewis acid. \$$\\mathrmCN^-\$$ is a negatively charged species (anion). It can donate a pair the electrons. So it is a Lewis base. The hydroxide ion \$$\\left(\\mathrmOH^-\\right)\$$ deserve to donate a pair that electrons and also so it is a Lewis base. The proton \$$\\left(\\mathrmH^+\\right)\$$ deserve to accept a pair of electron and so the is a Lewis acid.