List-I contains various reaction sequences and List-II contains...

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1. A$\mathrm{P}-2, \mathrm{Q}-3, \mathrm{R}-4, \mathrm{~S}-5$
2. B$\mathrm{P}-2, \mathrm{Q}-3, \mathrm{R}-5, \mathrm{~S}-1$
3. C$\mathrm{P}-3, \mathrm{Q}-5, \mathrm{R}-4, \mathrm{~S}-1$
4. D$\mathrm{P}-3, \mathrm{Q}-2, \mathrm{R}-5, \mathrm{~S}-4$