Chapter 8, Problem 8.16YT

Interpretation Introduction

Interpretation:

The incompatible species that makes the given mechanism unreasonable is to be labeled.

Concept introduction:

Under the acidic condition, strong basic intermediate or a species is not compatible because the proton transfer reaction between acid proton and the base ${}^{\text{-}}\text{OH}$ takes place immediately. Since acid-base reaction occurs faster than other elementary steps, this step makes an unreasonable mechanism.