Combining the two partial structures, we obtain for the full structure of the codling moth’s sexpheromoneThe compound is (2Z,6E)-3-ethyl-7-methyl-2,6-decadien-1-ol.(e)The sex pheromone of the honeybee is (E)-9-oxo-2-decenoic acid, with the structure(f)Looking frst at the C-2, C-3 double bond of the cecropia moth’s growth hormonewe fnd that its confguration is E, since the higher priority groups are on opposite sides of thedouble bond.The confguration of the C-6, C-7 double bond is also E.5.26We haven’t covered, and won’t cover, how to calculate the size of a dipole moment, but we can de-cide whether a compound has a dipole moment or not. Only compound B has dipole moment. Theindividual bond dipoles in A, C, and D cancel; therefore, none of these three has a dipole moment.5.27The alkenes are listed as follows in order of decreasing heat of combustion:
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