Analytical ChemistryHard

Question

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

Options

A.B(OMe)3
B.Na(OMe)
C.Al(OPR)3
D.Sn(OH)2

Solution

In the qualitative of BO33-, mixture is heated with conc. H2SO4 and little alcohol when trialkyl borate, R3BO3 is formed.
2BO33- + 2H2SO4 → 2H3BO3 + 3SO42-
H3BO3 + 3ROH → R3BO3 + 3H2O
The vapours of trialkly borate, B(OMe)3 impart green colour to the burner flame

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