Verified answer

CH3-CH(CH3)-CHCl-CH3 + NaOH(спирт р-р)--> CH3-C(CH3)=CH-CH3 + NaCl + H2O (Nr1 - 2-метилбутен-2)

CH3-C(CH3)=CH-CH3 + HBr --> CH3-C(CH3)(Br)-CH2-CH3 (Nr2 - 2-бром-2-метилбутан)

CH3-C(CH3)=CH-CH3 + Br2 --> CH3-C(CH3)(Br)-CHBr-CH3 (Nr3 - 2,3-дибром-2-метилбутан)

CH3-C(CH3)(Br)-CHBr-CH3 + Zn --> CH3-C(CH3)=CH-CH3 + ZnBr2 (Nr4 - 2-метилбутен-2)

3CH3-C(CH3)=CH-CH3 + 2KMnO4 + 4H2O --> 3CH3-C(CH3)(OH)-CHOH-CH3 + 2KOH + 2MnO2 (Nr5 - 2-метилбутандиол-2,3)