The general formula for unsubstituted alkanes is CnH2n+2
H H H
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H-C-H H-C-Br Cl-C-Cl
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H H Cl
Methane CH4 Bromomethane CH3Br Trichloromethane (Tri) CHCl3
H H H H H H
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H-C-C-H Br-C-C-Br Br-C-C-Cl
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H H H H H H
Ethane C2H6 1,2-dibromoethane C2H4Br2 1-bromo-2-chloroethane
H H H
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H-C-C-C-H
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H H H
Propane C3H8
H H H H
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H-C-C-C-C-H
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H H H H
Butane C4H10