Q.

A compound H3BO3 is heated with C2H5OH and H2SO4, the fumes produced burn with green flame.The green flame is due to the formation of

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a

B(C2H5 )3

b

B(OC2H5 )3

c

C2 H5 BH2

d

None of these

answer is B.

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Detailed Solution

When ortho boric acid is burnt with ethyl alcohol in presence of Conc H2SO4 gives triethyl ortho borate.When the vapours of triethyl borate ignited burn with a green edged flame.The green edged flame is due to the combustion of ethyl borate.This test is used to detect the borates and boric acid in qualitative analysis.
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