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AIIMS 2004

Exam: AIIMS
Year: 2004
Subject: Chemistry
Chapter: Practical Chemistry

AIIMS 2004 · Chemistry · Practical Chemistry

Which of the following imparts green colour to the burner flame?

Which of the following imparts green colour to the burner flame?

Options

A $\mathrm{B}(\mathrm{OMe})_3$
B $\mathrm{Na}(\mathrm{OMe})$
C $\mathrm{Al}(\mathrm{OPr})_3$
D $\mathrm{Sn}(\mathrm{OH})_2$ .

Correct answer

A. $\mathrm{B}(\mathrm{OMe})_3$

Step-by-step solution

The vapours of trialkyl borates

\mathrm{B}(\mathrm{OR})_3

or

R_3 \mathrm{BO}_3

burn with green edged flame. This is the qualitative test of borates.

\begin{array}{r}2 \mathrm{BO}_{3}{ }^{3-}+3 \mathrm{H}_{2}\mathrm{SO}_{4} → 3 \mathrm{SO}_{4}{ }^{2-}+\mathrm{H}_{3} \mathrm{BO}_{3}\\ \text{ boric acid }\\ \mathrm{H}_{3}\mathrm{BO}_{3}+3 \mathrm{ROH} \rightarrowR_3 \mathrm{BO}_{3}+3 \mathrm{H}_{2}\mathrm{O} \end{array}

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