C3h8-> ch3chbrch3-> c3h6-> ch6chohch3 с уравнениями реакций

CH3-CH2-CH3 + Br2 = CH3-CHBr-CH3 + HBr
CH3-CHBr-CH3 + KOH = CH3-CH=CH2 + KBr + H2O
CH3-CH=CH2 + H2O = CH3-CHOH-CH3