Question

Oxidative cleavage of an alkene with potassium permanganate and heat is effective in forming which of the following?

amines, amides, ketones, carboxylic acids

aldehydes, ketones

more than one of these is correct.

ketones, carboxylic acids, amines

carboxylic acids, ketones, carbon dioxide

Answer 1

Oxidative cleavage of alkene with KMnO₄ and heat is effective in forming following compunds depending on the structures of alkenes:

Carboxylic acid, ketones and carbon dioxide.

Examples:1) For terminal alkenes, one product is always formic acid which furthur oxidesed to CO₂ and H₂O.

Here(=CH₂) part gets oxidised to CO₂ and H₂O. Examples are given below:

2)For non-terminal alkenes,oxidative cleavage with KMnO₄ and heat give carboxylic acids and /or ketones depending on structure of alkene. When [ = CH(R)] part present ,the alkene first forms aldehydes which readily oxidised to carboxylic acids whereas,when [=CR₁(R₂)] part present it gives ketones.Examples are given below: