It is the simplest ketone molecule. This organic chemistry video tutorial provides a basic introduction into lewis acids and bases. That is why all bases are Lewis bases but not every Lewis base can be classified as a Brønsted base since, by definition, Brønsted base is a proton acceptor. A Lewis acid is a species that can accept an electron pair, whereas a Lewis base has an electron pair available for donation to a Lewis acid. Acetone is a volatile, flammable, colorless liquid. We will take this word as a synonym for Lewis base. Examine these two examples. The proton (H +), which has no valence electrons, is a Lewis acid because it accepts a lone pair of electrons on the base to form a bond.The proton, however, is just one of many electron-deficient species that are known to react with bases. Additional examples include: Methanol – CH3OH; Formaldehyde – H2CO; And even water – H2O; Lewis Acids and bases. Lewis Bases. For example, OH− and NH3 are Lewis bases, because they can donate a lone pair of electrons. Examples of Lewis Bases Few examples of Lewis bases are listed below – Any molecule, atom, or ion with a lone pair of electrons can act as Lewis bases. Base uses its highest occupied molecular orbital (HOMO) to form bonds with acids. It is also known as dimethylketone, dimethylcetone, azeton, β-Ketopropane and propan-2-one. Like many bases, it has a recognizable odor. Lewis Bases American chemist Gilbert N. Lewis discovered the covalent bond and intently studied the concept of electron pairs. This is an example of a Lewis acid-base reaction. Lewis base is any species that donates a pair of electrons to a Lewis acid to form a Lewis adduct. The adduct, Fe(H 2 O) 6 3+, involves bonding of 6 Lewis base species to one Lewis acid center. Instead the Lewis definition deals with the movement of electrons. The Lewis definition for acids and bases is the most extreme because it’s not dealing with protons specifically. Lewis bases bonded to a transition metal center are often called ligands. The Lewis structure of water suggests that this molecule has nonbonding pairs of valence electrons and can therefore act as a Lewis base. A Lewis acid is a chemical species that contains an empty orbital which is capable of accepting an electron pair from a Lewis base to form a Lewis adduct.A Lewis base, then, is any species that has a filled orbital containing an electron pair which is not involved in bonding but may form a dative bond with a Lewis acid to form a Lewis adduct. Acetone: C 3 H 6 O Acetone is a weak Lewis base. There are many reactions involving Lewis acids and bases. A nucleophile is a Lewis base as it is an electron surplus group and can donate electrons easily. Any base must have at least one lone pair or an electron pair in a π bond. Examples of Lewis Acid and Base Reactions. 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