During the fusion of an organic compound with sodium metal,the nitrogen present in the organic compound is converted into:

What happens when an organic compound is fused with sodium metal?

In $Lassaigne's$ test,the organic compound is fused with $Na$ metal followed by extraction with distilled water. Which of the following is not a possible product of this fusion reaction?

Lassaigne's test for nitrogen is negative for which compound?

In Kjeldahl's method of estimation of $N$,$CuSO_4$ acts as

Give the answers for the Lassaigne test:
$(i)$ If nitrogen and sulphur are both present,what observation is observed?
$(ii)$ If bromine is present,what is the observation?
$(iii)$ In the Lassaigne extract,if black precipitates are not obtained upon adding $CH_3COOH$ and lead acetate,what does this indicate?
$(iv)$ What is the reason for adding $FeSO_4$ to the Lassaigne extract?
$(v)$ Why is the Prussian blue colour observed?
$(vi)$ What does the violet colour with sodium nitroprusside in the Lassaigne extract indicate?