Question

16 multiple answer 2 points which of the following reactions produce diols from alkenes? ozonolysis followed by reductive work - up reaction with osmium tetroxide (oso₄) oxidation with cold dilute kmno₄ hydrogenation with h₂ and a catalyst

Explanation:

Step1: Analyze Ozonolysis followed by reductive work - up

Ozonolysis of alkenes followed by reductive work - up breaks the carbon - carbon double bond and forms carbonyl compounds (aldehydes or ketones), not diols.

Step2: Analyze Reaction with osmium tetroxide (\(OsO_4\))

\(OsO_4\) reacts with alkenes to form osmate esters, which on hydrolysis give 1,2 - diols (vicinal diols). The reaction is a syn - dihydroxylation reaction.

Step3: Analyze Oxidation with cold dilute \(KMnO_4\)

Cold dilute \(KMnO_4\) (Baeyer's reagent) reacts with alkenes to give 1,2 - diols (vicinal diols) through a syn - dihydroxylation mechanism.

Step4: Analyze Hydrogenation with \(H_2\) and a catalyst

Hydrogenation of alkenes with \(H_2\) and a catalyst (e.g., Pd, Pt, Ni) reduces the carbon - carbon double bond to a carbon - carbon single bond, forming alkanes, not diols.

Answer:

B. Reaction with osmium tetroxide (\(OsO_4\)); C. Oxidation with cold dilute \(KMnO_4\)