Question

Choose the reagents and reactant that would produce $1-$butene as the major product.

• A. I and II
• B. II
• C. II and III
• D. III

Answer 1

Answer: (C)

II and III

(1-butene)

(I) : Dehydration gives 2-butene as a major product.

(II) + (III) : Hofmann's Rule implies that steric effects have the greatest influence on the outcome of the Hofmann or similar eliminations. The loss of the β-hydrogen occurs preferably from the most unhindered (least substituted) position. So In both II and III, the major product would be 1-butene.