12. When(S)-1 bromo-1 fluoroethane reacts with sodium methoxide, an SN2 reaction takes place in which the atom is replaced by a methoxy group (OMe). The product of this reaction is (S) - 1 fluoro-1-methoxyethane. How can it be theat the starting material and the product both have the S- configuration? Shouldn't SN2 involve the change in configuration? Draw the starting material and the product of inversion, and then explain the anomaly.

Draw the structures of each types of pigment molecule: carotene, chlorophyll, pheophytins, and xanthophylls. Circle the polar segments of the molecules.

12 Beeswax is formed from palmitic acid (16:0) and triacontanol, CH3-(CH2)29-OH. Draw out structures to show how beeswax forms (draw reactants and product.) What functional group is present? Circle it in the structure for beeswax.

The prevalence of these organic substituents would indicate that a bio-molecule is a lipid? A) amide B) disulfide C) ester D) alcohol E)  lots of hydrocarbons in rings or chains The prevalence of this organic functional group would indicate that a bio-molecule is a carbohydrate. A) amide B) disulfide C) ester D) alcohol E)  lots of hydrocarbons in rings or chains