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In Lassaigne's test, a blue colour is ob...

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

A

`a) K _(4) [Fe (CN) _(6) ]`

B

b) Fe _(4) [ Fe (CN) _(6) ]_(3)`

C

c) `Na _(3)[Fe ( CN) _(6) ]`

D

d) `Cu _(2) [Fe ( CN) _(6) ]`

Text Solution

Verified by Experts

The correct Answer is:
B
In the Lassaigne.s test, a bulb colour is obtained if the organic compound contains nitrogen. The bulb colour is due to ferri-ferro cyanide i.e., `Fe _(4) [Fe (CN) _(6) ]_(3)`
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