(ch3)2ch-chbr-ch2br +zn -> A +HBr ->D+Koh(спирт) -> F+Br2 -> E. осуществить превращение.
CH3-CH(CH3)-CHBr-CH2Br + Zn = CH3-CH(CH3)-CH=CH2 (A) + ZnBr2;
CH3-CH(CH3)-CH=CH2 + HBr = CH3-CH(CH3)-CHBr-CH3 (D) + HBr;
CH3-CH(CH3)-CHBr-CH3 + C2H5OK = CH3-C(CH3)=CH-CH3 (F) + C2H5OH + KBr;
CH3-C(CH3)=CH-CH3 + Br2 = CH3-CBr(CH3)-CHBr-CH3 (E)