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B(3)^(3-)+Conc.H(2)SO(4)CH(3)-CH(2)-OH o...

`B_(3)^(3-)+Conc.H_(2)SO_(4)_CH_(3)-CH_(2)-OH overset(ignite)rarr(A)`
What is the oxidation number of central atom that is responsible for green flame in compound `(A)`?

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