b) Which of these dienophiles gives the FASTEST reaction with cyclopentadiene? CH2 CH2 A. В. C. || D.

Show complete mechanism including transition state for an SN2 reaction of a specific chiral alkyl halide with CN' as nucleophile. a. b. Specify the solvent and why would you choose it. c. Draw the energy profile diagram for the reaction. id. Explain the stereochemical course of the following reaction: Br O-H H2O CH — С—СН, — СН, — СН, + H-BV CH3 -C-CH2-CH2-CH3 Acetone CH2-CH3 CH2--CH3 Optically active Racemic

For each reaction below, provide all the expected constitutional isomer monohalogenated products. Ignore stereochemistry and do not include duplicates of the same constitutional isomers. Consider the expected selectivity (or lack of) for the chlorination and bromination reactions. Also consider possible resonance structures where appropriate a. b. Cl₂ heat NBS light

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