Question

An alkyne gives ethanoic acid as the only product on ozonolysis.The total number of ` cyclic isomers of that alkyne is ​

Answer 1

Ozonolysis refers to the organic chemical reaction where ozone is employed to cleave the unsaturated bonds of alkenes, alkynes, and azo compounds (compounds with the functional diazenyl functional group). It is an organic redox reaction.

Oxidation of alkenes with the help of ozone can give alcohols, aldehydes, ketones, or carboxylic acids.

Alkynes undergo ozonolysis to give acid anhydrides or diketones. If water is present in the reaction, the acid anhydride undergoes hydrolysis to yield two carboxylic acids.

Ozonolysis of elastomers is also known as ozone cracking. Trace amounts of ozone gas in the atmosphere cuts the double bonds in elastomers.

For azo compounds, the ozonolysis yields nitrosamines.

Ozonolysis Reaction

Ozone is a very reactive allotrope of oxygen. The reaction of ozone with alkenes and alkynes causes the oxidative cleaving of the alkene or alkyne. The carbon-carbon triple bonds are replaced with carbon-oxygen double bonds, giving the required carbonyl product as shown below.