Which of the following compounds is the most acidic?
A
(methane)
B
(acetic acid)
C
(methanol)
D
(methylamine)
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1
Identify the acidic proton in each compound: for methane (CH\_4), it's the hydrogen attached to carbon; for acetic acid (CH\_3COOH), it's the hydrogen on the carboxyl group (-COOH); for methanol (CH\_3OH), it's the hydrogen on the hydroxyl group (-OH); and for methylamine (CH\_3NH\_2), it's the hydrogen on the amine group (-NH\_2).
Recall that acidity depends on the stability of the conjugate base formed after deprotonation. The more stable the conjugate base, the stronger the acid.
Analyze the resonance and electronegativity effects: acetic acid's conjugate base (acetate ion) is resonance stabilized, which greatly increases its acidity compared to the others.
Consider the electronegativity of the atom bonded to the acidic hydrogen: oxygen (in -COOH and -OH) is more electronegative than nitrogen (in -NH\_2) and carbon (in methane), which generally increases acidity.
Compare the relative acid strengths by considering the pKa values or general trends: acetic acid has a much lower pKa (stronger acid) than methanol, methylamine, and methane, making it the most acidic among the given compounds.