Odpowiedź:
CH3-CH3 +Br2--> CH3-CH2Br +HBr
↑ bromoetan
CH3CH2Br +Br2 -->CH3-CHBr2 +HBr
↑dibromoetan
CH3-CH-Br2 +Br2 --> CH3-CBr3 +HBr
↑ tribromoetan