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Examples from thehomologous seriesof linear ketones in which a -carbonyl group is attached to thesecond carbon atom:
Note: Carbon atoms are counted from the right-side of molecules in the large table below but these structures could equally have been drawn the other way around, with carbon atoms counted from the left-side, i.e. the following two structures are equivalent andbothrepresent the same structure of2-butanone:
2-butanone
Likewise, the following two representations are alsoequivalent ways of drawing the same structure of2-butanoneas those represented above:
Therefore all four of the above representations of 2-butanone are equivalent.
Number carbons in chain
Other Names=Synonyns(*Examples not complete lists)
and simple formula
showing bond types but not accurate bond angles
3
2-propanone (C3H6O)
CH3COCH3
4
2-butanone (C4H8O)
CH3CH2COCH3
5
2-pentanone (C5H10O)
CH3CH2CH2COCH3
6
2-hexanone (C6H12O)
CH3CH2CH2CH2COCH3
7
2-heptanone (C7H14O)
CH3CH2CH2CH2CH2COCH3
8
2-octanone (C8H16O)
CH3CH2CH2CH2CH2CH2COCH3
9
2-nonanone (C9H18O)
CH3CH2CH2CH2CH2CH2CH2COCH3
10
2-decanone (C10H20O)
CH3CH2CH2CH2CH2CH2CH2CH2COCH3
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