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Q.

In Lassaigne's test, a blue colour is obtained if the organic compound contains nitrogen. The blue colour is due to the formation of

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a

K4Fe(CN)6

b

Fe4Fe(CN)63

c

Na3Fe(CN)6

d

Cu2Fe(CN)6

answer is B.

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Detailed Solution

If nitrogen is present in the organic compound then sodium extract contains NaCN.Na+C+N⟶ Fuse NaCNFeSO4+6NaCN⟶Na4Fe(CN)6+Na2SO4It changes to prussian blue Fe4Fe(CN)63 on reaction with FeCl3.4FeCl3+3Na4Fe(CN)6⟶Fe4Fe(CN)63+12NaCl
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