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\( \mathrm{Ph}-\mathrm{NH}_{2} \underset{0^{\circ} \mathrm{C}}{\stackrel{\mathrm{HNO}}{\longrightarrow}} \mathrm{A} \underset{\mathrm{BF}_{3}}{\stackrel{\mathrm{HF}}{\longrightarrow}} \mathrm{B} \stackrel{\triangle}{\longrightarrow} \mathrm{C}, \mathrm{C} \) is :
\( \mathrm{P} \)
(1) \( \mathrm{Ph}-\mathrm{N} \equiv \stackrel{\oplus}{\mathrm{N}} \stackrel{\ominus}{\mathrm{B} \dot{\mathrm{F}}_{4}} \)
(2)
W
(3)
(4) \( \mathrm{Ph}-\mathrm{F} \)
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