*Examples of solid organic compounds containing Nitrogen (N), Sulfur (S), Halogens (Cl, Br, I), and Phosphorus (P).used in element detection through Laissaigne method*

Compounds Containing Nitrogen (N):

1. Urea: CO(NH₂)₂

2. Benzamide: C₆H₅CONH₂

3. Aniline hydrochloride: C₆H₅NH₂·HCl

Compounds Containing Sulfur (S):

1. Thiourea: SC(NH₂)₂

2. Benzothiazole: C₇H₅NS

3. L-Cysteine: HSCH₂CH(NH₂)COOH

Compounds Containing Halogens (Cl, Br, I):

1. Chloroform (solid form): CHCl₃ (below 63°C)

2. Iodoform: CHI₃

3. Hexachlorobenzene: C₆Cl₆

Compounds Containing Phosphorus (P):

1. Triphenylphosphine oxide: (C₆H₅)₃PO

2. Phosphoric acid esters: (RO)₃PO (e.g., triethyl phosphate, where R = CH₂CH₃)

3. Aminomethylphosphonic acid: H₂NCH₂PO₃H₂

Compounds Containing Multiple Elements:

1. Nitrogen + Sulfur: Sulfanilamide (C₆H₄(SO₂NH₂)(NH₂))

2. Nitrogen + Halogen: Chloramine-T (C₇H₇ClNNaO₂S)

3. Sulfur + Phosphorus: Phosphorothioates (e.g., Malathion: C₁₀H₁₉O₆PS₂)

4. Nitrogen + Phosphorus: Ammonium phosphate (NH₄)₃PO₄