2) CH3-CH3->CH2=CH2->CH2Br-CH2Br->CH=CH

Question

2) CH3-CH3->CH2=CH2->CH2Br-CH2Br->CH=CH

Answer 1

1)С2Н6=С2Н4+Н2( реакция дегидрирования)
2)С2Н4+2Br2=C2H4Br2+HBr
3)C2H4Br2=C2H2+2HBr