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Read the following statements regarding chemical reactivity of group 15 elements.
(i) Only compound of \( \mathrm{Bi} \) with \( +5 \) oxidation state is \( \mathrm{BiF}_{5} \).
(ii) Intermediate oxidation states for both nitrogen and phosphorus disproportionate in both acid and alkali.
(iii) Nitrogen due to absence of d-orbitals in its valence shell cannot form \( \mathrm{d} \pi \)-p \( \pi \) bond as the heavier elements thus \( \mathrm{R}_{3} \mathrm{P}=\mathrm{O} \) exists but \( \mathrm{R}_{3} \mathrm{~N}=\mathrm{O} \) does not exists.
(iv) \( \mathrm{BiH}_{3} \) is the strongest reducing agent amongst the hydrides of nitrogen family.
(v) \( \mathrm{P}_{2} \mathrm{O}_{3} \) is more acidic than \( \mathrm{P}_{2} \mathrm{O}_{5} \).
Which of the following is the correct code for the statements above?
(a) FTFFT
(b) FFTTF
(c) TFTTF
(d) TFTFT
\( \mathrm{P} \)
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