Question

Addition of ozone molecule to alkene to form ozonide is known as:

Answer 1

Hint : We know that ozonolysis; which is composed of ‘ozone’ and ‘lysis’ is a method to cleave a double or triple bond. The unsaturated bond breaks and links to ozone so as to form an intermediate, which leads to breaking up of the compound.

Complete Step By Step Answer:
Ozonolysis is the process when any compound basically alkenes react with ozone and followed by hydrolysis yields various compounds. This involves the cleavage of the alkene from the double bonds and then its workup to form aldehydes or ketones. Ozonolysis is used to detect the position of double bonds in any alkene. The reactions shown are the reductive workup reactions. The oxidative workup involves the reaction of ozonide with hydrogen peroxide. The oxidative workup will convert the aldehydes formed into their respective carboxylic acids, while ketones will remain the same. Ozone has a bent structure and it is a polar molecule. As the distribution of electrons across the atoms in ozone is uneven, so the central atom has less electron density which results in polarity of molecules.
Ozone is a reactive allotrope of oxygen. It is also called trioxygen. As it has three oxygen atoms in its one molecule. In ozonolysis of alkenes, double bonds between carbon-carbon of alkene molecules are cleaved, and oxygen atoms of ozone get attached to it. It is a type of oxidation-reduction reaction. Ozonolysis of alkene gives alcohols, aldehydes, ketones or carboxylic acids. Ozonolysis doesn’t lead to further oxidation of aldehydes and ketones. The Addition of ozone molecules to alkene to form unstable ozonide followed by reduction with zinc dust and water to form carbonyl compounds is known as ozonolysis.

Note :
Remember that the ozonide is reduced to aldehydes and ketones by using a mild reducing agent such as dimethyl sulphide or zinc. If dimethyl sulphide is used as a reducing agent, then Sulphur also gets oxidized and forms dimethyl sulfoxide.