Ответ:

Объяснение:

CH3 - CH2 - CH2 - CH3 + Br2/hv ---- H3C-CH2-C (Br) (CH3) - CH3 (X1) + HBr;

H3C-CH2-C (Br) (CH3) - CH3 (X1) +NaOH = H3C-CH2-C (OH) (CH3) - CH3 (X2) + NaBr;

2H3C-CH2-C (Br) (CH3) - CH3 + 2Na = H3C-CH2-C (CH3) 2-C (CH3) 2-CH2-CH3 (X3) + 2NaBr;