Chemical formulas: methane-ethane-propane -butane-pentane -hexane-heptane-octane-nonandecane-

Homological series of alkanes:
Methane: CH4.
Ethane: C2H6.
Propane: C3H8.
Bhutan: C4H10.
Pentane: C5H12.
Hexane: C6H14.
Heptane: C7H16.
Nonandecane: CH3 (CH2) 17CH3.

Alkanes have low reactivity because contain strong single bonds that are difficult to break.
The melting and boiling points of alkanes increase with molecular weight and carbon backbone length.



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