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?

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 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?

Which of the following alkenes reacts fastest with $H\mathrm{Cl}$?

Given the following alkenes: (A) $\mathrm{CH}{2}_{=}\mathrm{CH}{2}_{}$ (ethylene), (B) $\mathrm{CH}{2}_{=}\mathrm{CHCH}$₃ (propene), (C) $\mathrm{CH}{3}_{}\mathrm{CH}=\mathrm{CHCH}$₃ (cis-2-butene), and (D) $\mathrm{CH}{3}_{}\mathrm{CH}=\mathrm{CHCH}$₃ (trans-2-butene), which of the alkenes above is the least stable (highest in energy)?

When compound A (2-butanol) is dehydrated using ${\mathrm{POCl}}_3$ and pyridine, which alkene is the major product?

As the chain length of alkynes increases, how are their $vapor pressure$ and $boiling point$ affected?