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A compound (A) of boron reacts with $\mathrm{NMe}^3$ to give an adduct $(\mathrm{B})$ which on hydrolysis gives a compound (C) and hydrogen gas. Compound (C) is an acid. Identify the compounds A, B and C. Give the reactions involved.
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$$
\text { } \mathrm{A}=\mathrm{B}_2 \mathrm{H}_6, \mathrm{~B}=\mathrm{BH}_3 \cdot \mathrm{NMe}_3, \mathrm{C}=\mathrm{B}(\mathrm{OH})_3 \text { i.e., } \mathrm{H}_3 \mathrm{BO}_3 \text {. }
$$
\text { } \mathrm{A}=\mathrm{B}_2 \mathrm{H}_6, \mathrm{~B}=\mathrm{BH}_3 \cdot \mathrm{NMe}_3, \mathrm{C}=\mathrm{B}(\mathrm{OH})_3 \text { i.e., } \mathrm{H}_3 \mathrm{BO}_3 \text {. }
$$
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