Chapter 11, Problem 11.66P

Write a stepwise mechanism for each of the following reactions. Explain why a more stable alkyne $\left(\text{but}-2-\text{yne}\right)$ is isomerized to a less stable alkyne $\left(\text{but}-1-\text{yne}\right)$, but under similar conditions, $\text{2, 5-dimethylhex}-3-\text{yne}$ forms $\text{2, 5-dimethylhexa}-2,3-\text{diene}$.