please answer question 6.28

a. Use Drago's E and C parameters to calculate H for the reactions of pyridine and BF3 and of pyridine and B(CH3)3. Compare your results with the reported experimental values of 71.1 and 64kJ/mol for pyridine B(CH3)3 and 105kJ/mol for pyridine BF3. b. Explain the differences found in part a in terms of the structures of BF3 and B(CH3)3. c. Explain the differences in terms of HSAB theory. 6.28 Repeat the calculations of the preceding problem using NH3 as the base, and put the four reactions in order of the magnitudes of their H values