Boron can be obtained by various methods but not by : (a) thermal decomposition of \( \mathrm{B}...

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Boron can be obtained by various methods but not by :
(a) thermal decomposition of \( \mathrm{B}_{2} \mathrm{H}_{6} \)
(b) pyrolysis of \( \mathrm{BI}_{3} \) (van Arkel)
(c) reducing \( \mathrm{BCl}_{3} \) with \( \mathrm{H}_{2} \)
(d) electrolysis of fused \( \mathrm{BCl}_{3} \)
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