Two alkenes (1,3-dimethyl-2-methylenecyclopentane and 1,2,3-trimethylcyclopent-1-ene) are formed by the elimination reaction of 1-bromo-1,2,5-trimethylcyclopentane with a strong base. Which of the following base would yield:
a. The highest percentage of 1,3-dimethyl-2-methylenecyclopentane?
b. The highest percentage of 1,2,3-trimethylcyclopent-1-ene?

• A. a. (iii)
  b. (iv)
• B. a. (ii)
  b. (iii)
• C. a. (iv)
  b. (i)
• D. a. (ii)
  b. (iv)

Answer: (A)