Which one of the following cannot be prepared from \( \mathrm{B}_{2...

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Which one of the following cannot be prepared from \( \mathrm{B}_{2} \mathrm{H}_{6} \) ?
(a) \( \mathrm{NaBH}_{4} \)
(b) \( \mathrm{B}_{2}\left(\mathrm{CH}_{3}\right)_{4} \mathrm{H}_{2} \)
\( \mathrm{P} \)
(c) \( \mathrm{B}_{2}\left(\mathrm{CH}_{3}\right)_{6} \)
(d) \( \mathrm{H}_{3} \mathrm{BO}_{3} \)
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