Chapter 11: Alkynes

Question: Draw a stepwise mechanism for the following reaction.

Question: Why is compound X formed in the following reaction instead of its constitutional isomer Y?

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

Question: Draw a stepwise mechanism for the following intramolecular reaction

Question: Explain why an optically active solution of methylbutyrophenone loses its optical activity when dilute acid is added to the solution.