a) (1) C2H6 C2H4 + H2
(2) nCH2 = CH2
b) (1) 2CH4 C2H2 + 3H2
(2) 2CH ≡ CH CH2 = CH – C ≡ CH
(3) CH2 = CH – C ≡ CH + H2 CH2 = CH – CH = CH2
(4) nCH2 = CH – CH – CH2
c) + Br + HBr.
a) (1) C2H6 => C2H4 + H2
(2) nCH2 => CH2- (-CH2-CH2-)n
b) (1) 2CH4 => C2H2 + 3H2
(2) 2CH ≡ CH => CH2 = CH – C ≡ CH
(3) CH2 = CH – C ≡ CH + H2 => CH2 = CH – CH = CH2
(4) nCH2 = CH – CH – CH2 => (-CH2-CH=CH-CH2)
c) C6H6 + Br =>C6H5Br + HBr.