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Compounds A and B are constitutional isomers with molecular formula C₅H₁₁Br.  Determine and draw the structures for compounds A and B based on the following information.  Use wedges and dashes as appropriate.  (10 pts)

a) Compound A is a good substrate for S_N2 type reactions, but a very poor one for S_N1 type reactions.
b) Compound A is chiral, with S configuration.
c) Compound B is a primary bromide that does not undergo S_N2 type reactions.