Acetone (CH3COCH3) is the major product in:I. CH2=C=CH2H3O+−−−→II. CH3C≡CHH2SO4/HgSO4/H2O−−−−−−−−−−−−−→III. CH3C≡CHBH3.THF−−−−−−−→H2O2/OH−