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(D) The reaction proceeds in two steps:$1$. Ozonolysis of cyclohexene with $O_3$ followed by $Zn/H_2O$ leads to the cleavage of the double bond to for

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Cyclopent$-1-$ene$-1-$carbaldehyde

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(D) The reaction proceeds in two steps:$1$. Ozonolysis of cyclohexene with $O_3$ followed by $Zn/H_2O$ leads to the cleavage of the double bond to form hexane$-1,6-$dial (adipaldehyde),which is product $(P)$.$2$. The treatment of hexane$-1,6-$dial with $OH^-/\Delta$ involves an intramolecular aldol condensation. The aldehyde group at one end acts as an electrophile,and the $\alpha$-carbon of the other aldehyde group acts as a nucleophile. This results in the formation of a five-membered ring with an aldehyde group attached to the double bond,which is cyclopent$-1-$ene$-1-$carbaldehyde,product $(Q)$.

Product $(Q)$ is :-

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