Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E. Compound E on further treatment with aqueous KOH yields compound F. The compound F is:
In the first step, ozonolysis of cyclohexene is followed by reduction with zinc. We get the dicarbonyl 1,6-hexanedial.
The next step involves intramolecular Aldol addition-elimination to gives us the α-β unsaturated aldehyde. Thus we get: