When compound A, 2-butanol (${\mathrm{CH}}_3\mathrm{CH}\left(\mathrm{OH}\right)\mathrm{CH}2{\mathrm{CH}}_3$), is dehydrated with concentrated $H_2\mathrm{SO}4$, what is the major alkene product?

Which of the following alkenes is the most stable?

Which of the following is the most stable alkene?

When $3$-bromo-$3$-methylheptane is treated with a strong base, how many different alkenes (constitutional isomers) can be formed as major products via E$2$ elimination?

Which of the following alkenes would you expect to have the lowest heat of hydrogenation?

Which of the following alkenes is classified as an $E$ (entgegen) alkene?

Which reagent or test could be used to distinguish between $3-\mathrm{pentyne}$ and $1-\mathrm{pentyne}$?

Which of the following molecules contains a triple bond?

When $2-\mathrm{bromo}\mathrm{octane}$ is treated with a strong base, how many different alkenes (constitutional isomers) can be formed as major products via $E2$ elimination?