Sodium borate on reaction with conc. \(\mathrm{H}_{2} \mathrm{~S} \mathrm{O}_{4}\) and \(\mathrm{C}_{2}…

Sodium borate on reaction with conc. \(\mathrm{H}_{2} \mathrm{~S} \mathrm{O}_{4}\) and \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) gives a compound (A) which burns with a green edged flame. the compound (A) is:
  1. \(\mathrm{H}_{2} \mathrm{Bu} \mathrm{O}_{7}\)
  2. \(\left(\mathrm{C}_{2} \mathrm{H}_{5}ight)_{2}\mathrm{~B}_{4} \mathrm{O}_{7}\)
  3. \(\mathrm{H}_{3} \mathrm{BO}_{3}\)
  4. \(\left(\mathrm{C}_{2} \mathrm{H}_{5}ight)_{3} \mathrm{BO}_{3}\)

Solution

\(\mathrm{Na}_{3} \mathrm{BO}_{3}+\underset{\mathrm{conc.}}{\mathrm{H}_{2} \mathrm{SO}_{4}} \longrightarrow 3 \mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{2} \mathrm{H}_{3} \mathrm{BO}_{3}\)
\(\mathrm{H}_{3} \mathrm{BO}_{3}+3 \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH} \longrightarrow \left(\mathrm{C}_{2} \mathrm{H}_{5}ight)_{3} \mathrm{BO}_{3} \text { or }\left(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{O}ight)_{3} \mathrm{~B}\)

Asked in: JEE-TOPICTESTS-CHEMISTRY

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