List-I contains various reaction sequences and List-II contains the possible products. Match each entry in List-I with the appropriate entry in List-II and choose the correct option.
(P) Ozonolysis followed by base-induced rearrangement and protection
The reaction sequence cleaves a benzene ring, forming a six-membered hydroxy-containing ring.
Matches: (3)
(Q) Ozonolysis, protection, and hydroboration-oxidation
Leads to hydroxylation and the introduction of a methyl group.
Matches: (5)
(R) Hydration followed by reduction
Produces a hydroxy-substituted five-membered ring with a retained carbonyl group.
Matches: (4)
(S) Hydroboration-oxidation followed by reduction
Converts the five-membered ring into a hydroxyl-functionalized product.
Matches: (1)
Step 2: Conclusion
(P) → (3)
(Q) → (5)
(R) → (4)
(S) → (1)
Thus, the correct answer is (A) P-3, Q-5, R-4, S-1.
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Approach Solution -2
To solve the problem, we analyze each reaction sequence and determine the corresponding product structure based on the given reagents and conditions.
1. For (P):
- Ozonolysis of cyclohexene with Zn and aqueous NaOH gives a dione intermediate.
- Treatment with ethylene glycol and PTSA forms an acetal.
- Hydroboration-oxidation (BH3, H2O2, NaOH) adds hydroxyl groups.
- Acidification and reduction (H3O+, NaBH4) complete the process.
- The product corresponds to structure (3), a diol on cyclopentane with a methyl substituent.
2. For (Q):
- Similar steps applied to methylcyclopentene.
- Results in a diol with hydroxyls and a methyl group, structure (5).
3. For (R):
- Starting from methylcyclopentenone.
- Protection, oxymercuration-demercuration, acidification, and reduction lead to structure (4).
4. For (S):
- Starting from methylcyclopentenone.
- Protection, hydroboration-oxidation, acidification, and reduction lead to structure (1).
