Old bottles of ${\mathrm{diethyl}}_{\mathrm{ether}}$ are often contaminated with which dangerous compound?

Which sequence of reactions could be used to convert ${\mathrm{CH}}_3\mathrm{CH}{2}_{\mathrm{Br}}$ to ${\mathrm{CH}}_3\mathrm{CH}{2}_{\mathrm{OH}}$?

What is the major product formed when ${\left(CH3\right)}_{2}C\equiv CHCH2COCH2CH2COOCH2CH3$ is treated with excess $H2$ (2 equivalents) in the presence of a metal catalyst?

Which of the following compounds might be expected to react with $NaN{H}_2$?

Which set of reagents would convert an alkene to a vicinal diol via syn addition?

Which set of reagents is required to convert ${\mathrm{CH}}_3\left({\mathrm{CH}}_2\right)\mathrm{CH}\equiv {\mathrm{CH}}_2$ to ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_{2}C\equiv \mathrm{CH}$?

What is the major product when propene reacts with $HBr$ under standard conditions?

Which of the following is the product of the reaction between $C_2{H}_5\mathrm{Br}$ and aqueous $\mathrm{NaOH}$ under reflux conditions?

Which reagent is required to convert $\left({\mathrm{CH}}_3\right)2^{}\mathrm{CHCH}2\mathrm{COCl}$ (an acid chloride) into $\left({\mathrm{CH}}_3\right)2^{}\mathrm{CHCH}2\mathrm{CONH}2$ (an amide)?