From 4-pentin-1-ol obtain:

SOLUTION:



[1] Oxidation of the alcohol to aldehyde
[2] Formation of the carbon-carbon bond by magnesium organometallics
[3] Protonation of the alcohol
[4] Oxidation of the alcohol with Jones (You can also use CrO ₃ (py) ₂ )
[5 ] Markovnikov hydration of the alkyne, to form ketones