The presence of halogen in an organic compound is detected by:

Beilstein test is used for the detection of which one of the following elements?

Match List-$I$ with List-$II$:

List-$I$ (Test/Reagents/Observation)	List-$II$ (Species detected)
$(a)$ Lassaigne's Test	$(i)$ Carbon
$(b)$ $Cu(II)$ oxide	$(ii)$ Sulphur
$(c)$ Silver nitrate	$(iii)$ $N, S, P,$ and halogen
$(d)$ The sodium fusion extract gives black precipitate with acetic acid and lead acetate	$(iv)$ Halogen specifically

The correct match is:

For testing halogens in an organic compound with $AgNO_{3}$ solution,sodium extract (Lassaigne's test) is acidified with dilute $HNO_{3}$. What will happen if a student acidifies the extract with dilute $H_{2}SO_{4}$ in place of dilute $HNO_{3}$?

Sodium fusion extract of which compound gives Prussian blue colour with $FeSO_4$?

Why is the Lassaigne's extract boiled with concentrated $HNO_3$ before testing for halogens?