9. Alkenes and Alkynes

Which of the following alkenes is the major product according to the $\mathrm{Zaitsev}$ rule in the $E2$ dehydrohalogenation of $2-\mathrm{bromobutane}$?

Using Zaitsev's rule, which of the following alkenes is expected to be the most stable product in an elimination reaction?

Which of the following alkenes is the major (Zaitsev) product formed in the E2 dehydrohalogenation of $C_3{H}_7\mathrm{Br}$ (2-bromopropane) with a strong base?

What is the major product of the reaction?

What is the major product of the reaction?

What is the major product of the reaction?