\( P \)....
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\( P \)
(1) Compound \( \mathrm{A} \) is \( \mathrm{S} \)
(2) Compound \( \mathrm{A} \) is \( \mathrm{H}_{3} \mathrm{C}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{Br} \)
(3) Regent \( \mathrm{B} \) is \( \mathrm{H}_{2} / \mathrm{Ni} \) at \( 120^{\circ} \mathrm{C} \)
(4) Reagent B is \( \mathrm{LiAIH}_{4} \)
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