is a double bond between C-2 and C-3. The rest of the name provides the information thatthere are four methyl groups and that they are located at C-2, C-6, C-10, and C-14.(b)An allyl group is CH2?CHCH2@. Allyl isothiocyanate is therefore CH2?CHCH2N?C?S.5.25(a)The Econfguration means that the higher priority groups are on opposite sides of the doublebond.(b)Geraniol has two double bonds, but only one of them, the one between C-2 and C-3, is capa-ble of stereochemical variation. Of the groups at C-2, CH2OH is of higher priority than H. AtC-3, CH2CH2outranks CH3. Higher priority groups are on opposite sides of the double bondin the Eisomer; hence geraniol has the structure shown.(c)Since nerol is a stereoisomer of geraniol, it has the same constitution and differs from gera-niol only in having the Zconfguration of the double bond.(d)Beginning at the C-6, C-7 double bond, we see that the propyl group is of higher priority thanthe methyl group at C-7. Since the C-6, C-7 double bond is
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