Alkanes or saturated hydrocarbons contain only single covalent bonds between carbon atoms each of the carbon atoms in an alkane has sp3 hybrid orbitals and is bonded to four other atoms each of which is either carbon or hydrogen the lewis structures and models of methane ethane and pentane are illustrated in figure 222 1. Alkenes and aromatics the molecular world taylor pg gagan jmf isbn 9780854046805 kostenloser versand fur alle bucher mit versand und verkauf duch . Alkenes alkynes and aromatic compounds introduction to general organic and biochemistry 12th biology chemistry frederick a bettelheim william h bro. Biologically important molecules such as deoxyribonucleic acid dna c also contain an aromatic ring structures thus they have formulas that can be drawn as cyclic alkenes making them unsaturated however due to the cyclic structure the properties of aromatic rings are generally quite different and they do not behave as typical alkenes
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