Match List-I with List-II:

Choose the correct answer from the options given below:

(A) - (II), (B) - (I), (C) - (IV), (D) - (III)

The correct answer is Option (1) → (A) - (II), (B) - (I), (C) - (IV), (D) - (III).

Let us go over each option in detail to understand the correct matching between List-I and List-II:

(A) \(COCl_2\) (Phosgene) - (II) Poisonous gas

Phosgene (COCl₂) is a toxic, colorless gas that was historically used as a chemical warfare agent during World War I. It is highly reactive and can be lethal if inhaled, causing damage to the lungs and respiratory system. 

Hence, COCl₂ is best matched with Poisonous gas.

(B) CH₃−C₆H₄−SO₂Cl (p-Toluenesulfonyl chloride) - (I) To distinguish between primary, secondary, and tertiary amines

p-Toluenesulfonyl chloride is a reagent used in the Hinsberg test, a classical method for distinguishing between primary, secondary, and tertiary amines.

Primary amines react with it to form soluble sulfonamides.

Secondary amines form insoluble sulfonamides.

Tertiary amines do not react.

Thus, CH₃−C₆H₄−SO₂Cl is used to distinguish between different types of amines and is matched with (I).

(C) NH₃⁺−C₆H₄−SO₃⁻ (Amino-benzenesulfonate ion) - (IV) Zwitterion

This compound is a zwitterion, meaning it contains both a positively charged ammonium group (NH₃⁺) and a negatively charged sulfonate group (SO₃⁻) within the same molecule. A zwitterion has both positive and negative charges, which balance each other out, making it neutral overall but with ionic centers. Therefore, NH₃⁺−C₆H₄−SO₃⁻ matches (IV) Zwitter ion.

(D) Isoindoline-1,3-dione - (III) Synthesis of primary amines

Isoindoline-1,3-dione is a chemical structure involved in organic synthesis. It can undergo chemical reactions to produce primary amines through reduction or related transformations.

Primary amines are a key class of compounds used in many organic synthesis reactions.

Therefore, Isoindoline-1,3-dione matches with (III) Synthesis of primary amines.