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alkane-CnH2n+2 alkene-CnH2n alkyl-CnH2n+1 aldehyde-R-CHO where R is any alkyl group ketone-R-CO-R where R is any alkyl group cycloalkane-CnH2n. svetlana Â· 5 years ago.
The most simple alkane is methane with the formula CH4. The second alkane is ethane with the formula C2H6. The general formula of alkanes is CnH2n+2. The first four alkanes are methane (CH4), ethane (C2H6), propane (C3H8) and butane (C4H10). The simplest alkane is the gas methane, whose molecular formula is CH4. Methane exists as a tetrahedral shape, but it is often represented by a flattened structure as are most organic compounds. Flattened structures for the three simplest alkanes are given in the Figure below.