Select the correct statement : (a) \( \mathrm{B}-\mathrm{F} \) bond length in \( \mathrm{BF}_{3}...

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Select the correct statement :
(a) \( \mathrm{B}-\mathrm{F} \) bond length in \( \mathrm{BF}_{3}\mathrm{BF}_{4}^{-} \)
(b) \( \mathrm{N}-\mathrm{H} \) bond length in \( \mathrm{NH}_{3}\mathrm{NH}_{2}^{-} \)
\( \mathrm{P} \)
(c) \( \mathrm{P}-\mathrm{H} \) bond length in \( \mathrm{PH}_{3}\mathrm{PH}_{4}^{+} \)
(d) \( \mathrm{C}-\mathrm{H} \) bond length in \( \mathrm{CH}_{3}^{+}\mathrm{CH}_{4} \)
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