Write the correlated terms:
(1) Propene : Double bond :: Propyne : …………. .
(2) Ethane : CH3 – CH3 :: Ethene : ……………. .
(3) Hydrogen : Monovalent :: Carbon : ……………. .
(4) Methane : Low melting point i.e. -182.5°C Diamond : ……………. .
(5) Graphite : Hexagonal structure :: Diamond : …………. .