Consider the following reaction: \( \mathrm{A}+ \) alkali \( \rightarrow \mathrm{B} \) (Major Pr...

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Consider the following reaction:
\( \mathrm{A}+ \) alkali \( \rightarrow \mathrm{B} \) (Major Product )
If \( \mathrm{B} \) is an oxoacid of phosphorus with \( -\mathrm{P}-\mathrm{H} \) bond, then \( \mathrm{A} \) is:
(a) White \( \mathrm{P}_{4} \)
(b) \( \operatorname{Red} \mathrm{P}_{4} \)
(c) \( \mathrm{P}_{2} \mathrm{O}_{3} \)
(d) \( \mathrm{H}_{3} \mathrm{PO}_{3} \)
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