The following compounds can all react as bases.

b. Rank the conjugate acids in the order you would predict, from most stable to least stable.

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Identify the conjugate acids of each base. For each base, add a proton (H⁺) to the atom that can accept it. For example, for CH₃CH₂NH₂, the conjugate acid is CH₃CH₂NH₃⁺.

Consider the stability of each conjugate acid. Stability is often influenced by factors such as resonance, inductive effects, and the electronegativity of the atom bearing the positive charge.

Evaluate the resonance stabilization. For example, the conjugate acid of CH₃CONH₂ can be resonance stabilized due to the adjacent carbonyl group.

Assess the inductive effects. Electronegative atoms or groups can stabilize a positive charge through the inductive effect. For instance, the presence of an electronegative oxygen in CH₃CH₂OH can stabilize the conjugate acid.

Rank the conjugate acids from most stable to least stable based on the above evaluations. Consider the overall effect of resonance, inductive effects, and electronegativity on the stability of each conjugate acid.

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Conjugate Acid-Base Pairs

In acid-base chemistry, a conjugate acid-base pair consists of two species that transform into each other by the gain or loss of a proton (H+). When a base gains a proton, it forms its conjugate acid. Understanding the stability of conjugate acids is crucial for predicting the strength of the original bases, as more stable conjugate acids correspond to weaker bases.

Acid Stability and Resonance

The stability of a conjugate acid is often influenced by resonance, which delocalizes charge over multiple atoms, reducing the energy of the molecule. For example, amides can stabilize their conjugate acids through resonance between the nitrogen and the carbonyl group, making them more stable compared to non-resonance-stabilized species. This concept helps in ranking the stability of conjugate acids.

Electronegativity and Inductive Effects

Electronegativity and inductive effects play a significant role in acid stability. Electronegative atoms or groups can stabilize a conjugate acid by withdrawing electron density through sigma bonds, known as the inductive effect. This effect can enhance the stability of a conjugate acid by dispersing charge, making it a key factor in determining the relative stability of different conjugate acids.

The following compounds can all react as bases.b. Rank the conjugate acids in the order you would predict, from most stable to least stable.