5. ch3 — c ≡ cag x1 x2 x1 ацетон x3

CH3 — C ≡ CAg +HCL= CH3 — C ≡ CH + AgCl
CH3 — C ≡ CH + HBr =  CH3 — CBr = CH2
CH3 — CBr = CH2 +KOH (спирт) = CH3 — C ≡ CH +KRr +H2O

CH3 — C ≡ CH  +H2O( HgSO4,H2SO4) = (CH3)2-C=O