(a) Give the alkyl halide that will only form 2,4-dicyclopentylpent-3-ene as a product when it reacts with potassium tert-butoxide via the E2 mechanism.
(b) What is the required stereochemistry of the alkyl halide to form the following product?

• A. (a)(b)The β-hydrogen and the Br leaving group must have an anti-coplanar stereochemistry.
• B. (a)(b)The β-hydrogen and the Br leaving group must have an anti-coplanar stereochemistry.
• C. (a)(b)The β-hydrogen and the Br leaving group must have a syn-coplanar stereochemistry.
• D. (a)(b)The β-hydrogen and the Br leaving group must have a syn-coplanar stereochemistry.

Answer: (B)