In the following conversion \( \mathrm{P} \) W Which of the followi...
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In the following conversion
\( \mathrm{P} \)
W
Which of the following regents is suitable?
(1) \( \mathrm{NH}_{2} \mathrm{NH}_{2}, \mathrm{KOH} \), DMSO
(2) \( \mathrm{NaBH}_{4} \)
(3) \( \mathrm{Zn}-\mathrm{Hg} \), concentrated \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
(4) \( \mathrm{LiAlH}_{4} \)
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