Which of the following organic substances has the strongest conjugate base?
1. hydrochloric acid
2. trimethylamine (pKa = 9.80)
3. glutamic acid (pKa = 2.13)
4. benzylamine (pKa = 9.33)
5. quinine (pKa1 = 8.52)
6. cyclohexylamine (pKa = 10.66)
7. pyridine (pKa = 5.25)
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