Chapter 11, Problem 11.42P

Interpretation Introduction

Interpretation:

The complete mechanism for the given reaction is to be drawn.

Concept introduction:

Electrophilic addition of ${\text{H}}^{\text{+}}$ to the $\text{C}\equiv \text{C}$ triple bond produces a carbocation. The strong acid is used as a source of ${\text{H}}^{\text{+}}$. In Step 2, the nucleophile attacks the positively charged C in a coordination step. Further deprotonation of oxygen gives an uncharged product.