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

Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

In the detection of halogens,what is formed by adding $AgNO_3$? What is its colour?

The compound that does not give a positive test for nitrogen in Lassaigne's test is

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

List-$I$ (Reagent)	List-$II$ (Functional Group detected)
$A$. Sodium bicarbonate solution	$I$. Double bond/unsaturation
$B$. Neutral ferric chloride	$II$. Carboxylic acid
$C$. Ceric ammonium nitrate	$III$. Phenolic $-OH$
$D$. Alkaline $KMnO_4$	$IV$. Alcoholic $-OH$

Choose the correct answer from the options given below:

An organic compound containing phosphorus on oxidation with $Na_2O_2$ gives a compound '$X$'. This '$X$' when boiled with $HNO_3$ followed by treatment with ammonium molybdate reagent gives a yellow precipitate '$Y$'. '$X$' and '$Y$' respectively are: