Question

1" (20%) In t pyridines at 25°C. he table below are pKa values for the conjugate acid form of substituted Compound Pyridine 4-amino-pyridine 3-bromo-pyridine pKa 5.25 9.11 2.84 3-chloro-pyridine2.84 3.5-dimethyl-pyridine 6.15 6 Pyridine pyridinium ion 4-methoxy-pyridine 6.47 (a) Use these data to determine the susceptibility constant (p) for the ionization of pyridines HINT: You are calculating one value of p for the entire class of pyridine compounds. Also 0.39 and for the methoxy n the para position. (b) Calculate the fraction of 4-amino-pyridine present note that the Hammet constant for Br in the meta position is group it is its ion form at pH 7.5 ction fote4 DNP

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Answer 1

13 Mt S08 The vale of P ditlir as i wauld hal Capleey

NI Mt 0-11 T S +9-11 b l Ra lO 401 0.0329 CI CitC