An alkane "A" on reaction with O3 and Zn-H2O gives propane and ethanal in equimolar ratio. Addition of HCl to Alkane "A" gives "B" as the major product. The structure of the product "B" is
This oxidation of alkene occurs at the double bond. Thus, propane & ethanol must combine to give the alkene
Now this reacts with HCl to form B as follows:
Option 3 is correct.