Question

50. Which of the following reagent is suitable for syn-hydroxylation of cycloalkene?
(a) Cold alkaline KMnO4
(b) Hot KMnO4
(d) Hg(OAc)2
(c) HCOOOH​

Answer 1

Answer:

All the four reactions are correct.

(A) When cyclopentene is heated with alkaline potassium permanganate solution, the C atoms attached to double bond are oxidized to carboxylate ions.

(B) Reductive ozonolysis of cyclopentene gives pentanedial (glutaraldehyde).

(C) When cyclopentene reacts with a cold dilute solution of potassium permanganate, a vicinal diol is obtained. This is an example of dihydroxylation.

(D) Epoxidation of cyclopentene with perbenzoic acid in dichloromethane gives an epoxide.