CH3-CH-CH3+Br2-X1+KOH(cп.р)-X2+HBr-X3 CH3

Предыдущий
вопрос Следующий
вопрос

-CH2-CH3

Explanation:
X1: Addition of Br2 to CH3-CH-CH3 yields CH3-CH-CH2Br-CH3
X2: Reaction with KOH leads to the formation of CH3-CH=CH2 + KBr + H2O
X3: Finally, treatment with HBr results in CH3-CH2-CH3 + HBr