2-гидроксобутан
CH3-CH=CH-CH3 ---(H2O/H2SO4)---> CH3-CH2-CH(OH)-CH3
CH3-CH2-CH(Br)-CH3 + NaOH(водн) = CH3-CH2-CH(OH)-CH3 + NaBr
CH3-CH2-CH(OH)-CH3 + POCl5 = CH3-CH2-CH(Cl)-CH3 + POCl3 + HCl
CH3-CH2-CH(OH)-CH3 ---(H2SO4/t)---> CH3-CH=CH-CH3
CH3-CH2-CH(OH)-CH3 ---(жёсткое окисление)---> CH3-CH2-CHO + HCOH
CH3-CH2-CH(OH)-CH3 ---(KMnO4/H+,t)---> CH3-CH2-C(=O)-CH3