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:

1. A. H3C - Cl | CH - CH3 | CH - CH3
2. B. Cl - CH2 - CH2 - CH3 | CH3 | CH
3. C. H3C - CH2 - CH2Cl | CH - CH3
4. D. H3C - CH2 - CH3 | Cl | C - CH3

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