The transition state structure is given. You have to decide which pairing of spe

Question

The transition state structure is given. You have to decide which pairing of species will result in the reaction for which the equilibrium lies to the right (i.e., product side is favored which results in K >1) and then give the name of the indicated species. You may use the pKa table (click here) to get pKa values and species names.

Points to remember:
1) the equilibrium favors the weak side
2) the weak side is the lower energy side (processes in nature will spontaneously go to lower energy)
3) the partial charges in the transition state show how the formal charges are changing during the course of the reaction.

(a) Rxn I

(b) Rxn II

The transition state structure is given. You have to decide which pairing of species will result in the reaction for which the equilibrium lies to the right (i.e., product side is favored which results in K > 1) and then give the name of the indicated species. You may use the pKa table (click here) to get pKa values and species names. the equilibrium favors the weak side the weak side is the lower energy side (processes in nature will spontaneously go to lower energy) the partial charges in the transition state show how the formal charges are changing during the course of the reaction.

Explanation / Answer

(a) CH3O- + NH4+ -> CH3OH + NH3

(B) H2O + NH2- -> OH- + NH3 [since NH3 is weaker acid than H2O]

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