$$\begin{gathered} {\mathrm{Na}}_2{ \mathrm{B}}_4{\mathrm{O}}_7+\text{ Conc. }{\mathrm{H}}_2{\mathrm{SO}}_4\to \mathrm{A}\underset{\text{ ii) Iginte }}{\overset{\text{ i) }{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\to }}\mathrm{B} \\ (\mathrm{Green} \mathrm{edged} \mathrm{flame}) \end{gathered}$$

Identify A and B.