An alkene “A” on reaction with O3 and Zn-H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is 

Question : An alkene “A” on reaction with O3 and Zn-H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is

answer : from all above options the correct answer is option (3) this reaction will take place as given below –

answer explanation : as we can seen in this that A reacting with O3 and Zn-H2O and giving propanone and ethanol after this reaction as a product. and when this structure A react with HCl then they will form structure denoted by B which is given in our option (3) , hence our option (3) is correct answer for this question.