Match the compounds in List-I with the appropriate observations in List-II and choose the correct option.
\( P \to 1; \ Q \to 5; \ R \to 4; \ S \to 2 \)
\( P \to 2; \ Q \to 5; \ R \to 1; \ S \to 3 \)
\( P \to 5; \ Q \to 2; \ R \to 1; \ S \to 4 \)
\( P \to 2; \ Q \to 1; \ R \to 5; \ S \to 3 \)
