Write the structure of the alkene which on ozonolysis gives butanone and ethanal .

The alkene which will give butanone and ethanal on ozonolysis is 3-Methylpentene. It will dissociate from the double bond to give the products as shown below. By the ozonolysis we can get desired products.

What are the methods of preparation of alcohols and phenols ?

What are the methods of preparation of Aldehydes and Ketones ?

What are the methods of preparation of Carboxylic Acids ?

Carboxylic acids are prepared by various methods like oxidation of primary alcohols, oxidation of aldehydes and ketones, hydrolysis of nitriles, grignard reagents, hydrolysis of esters etc.