a. Draw the skeletal formula of pentane, a straight chain hydrocarbon with a molecular formula of C₅H₁₂.

b. Draw the structural formulae of the molecules shown in Figure 14.2, parts d, e and f.

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Structure of functional group General formula Name of an example Structural formula of the example C,H2 ethene CH,-CH, n "2n alkenes, C=C CH,- benzene arenes, halogenoalkanes, –X, where X = F, CI, Br, I C,H, + X alcohols, -OH chloromethane methanol CH,CI CH,OH CH,CHO "2n 2n+ C,H2n + 1CHO ethanal aldehydes, C,H2n +COCHm + 1 CH,COCH, propanone "m' ketones, C,H2n + COOH ethanoic acid CH,COOH carboxylic acids, OH C,Han +COOC Hm+1 ethyl ethanoate CH,COOC,H, m' 2m + 1 esters,- amines, -NH, nitriles, -CN methylamine ethanenitrile CH,NH, 2n + C,H20 + CN CH,CN AC Table 14.2 Some common functional groups. Go