Properties of Alkanes/ Alkenes/ Alkynes (10 th Carbon and its compounds) Properties of Alkanes/ Alkenes/ Alkynes (a) Alkanes are gas (C 1 to C 4 ) ; liquid (C 5 to C 17 ) and rest are solid at room temperature. (b) The melting and boiling point of Alkanes increases with increase in number of C – atom in Alkanes. Alkane Formula Boiling point [°C] Melting point [°C] State (at 20 °C) Methane CH 4 -162 -182 gas Ethane C 2 H 6 -89 -183 gas Propane C 3 H 8 -42 -188 gas Butane C 4 H 10 0 -138 gas Pentane C 5 H 12 36 -130 liquid Hexane C 6 H 14 69 -95 liquid Heptane C 7 H 16 98 -91 liquid Octane C 8 H 18 126
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