Compounds A and B was discovered by a group of scientists. Compound A is a dipeptide, optically inactive. While compound B is a tripeptide and optically active. Compound A is formed when compound C and compound D joined together by condensation reaction. Whereas monomers E and F are formed by modifying the compounds C and D. Polymer G is formed by the condensation reaction of monomers E and F. Draw the possible structural formulae of compounds A, B, C, D, E, F and polymer G. Label the peptide bond(s) for compounds A and B. With the aid of diagram, discuss why compounds A and B are classified as an optically inactive compound and optically active compound, respectively? Draw the possible structural formulae for repeating unit of polymer G. How would you distinguish between polymer G and their repeating unit?

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