Draw up the reaction equations that characterize the chemical properties of butane, butyne, butene.

1. Reactions of butane:
H3C – CH2 – CH2 – CH3 + Br2 = H3C – CH2 – CH2 – CH2Br + HBr – substitutions;
H3C – CH2 – CH2 – CH3 + HO – NO2 = H3C – CH2 – CH2 – CH2 – NO2 + H2O – nitration;
C4H10 = C4H8 + H2 – dehydrogenation.
2. Butene reactions:
H2C = CH – CH2 – CH3 + Br2 = H2CBr – CH – Br – CH2 – CH3 – addition;
H2C = CH – CH2 – CH3 + HBr = H3C – CHBr – CH2 – CH3 – additions;
C4H8 + H2 = C4H10 – hydrogenation.
3. Reactions of butin:
C4H6 + 2Br2 = C4H6 (Br) 4 – addition;
C4H6 + HBr = C4H7Br – additions;
C4H6 + 2H2 = C4H10 – hydrogenation.
Bhutan is a representative of alkanes. Butene belongs to alkenes. Butin is a hydrocarbon of the alkynes class.