Concept Explanation: Organic Reaction Analysis and Polymer Classification

Let's analyze the given reactions step by step:

Step 1: Understanding Reaction-1

The first reaction shows ethylene undergoing ozonolysis. Ozonolysis of alkenes cleaves the double bond to form carbonyl compounds.

For ethylene (CH₂=CH₂):

This produces formaldehyde (HCHO). However, the problem mentions "oxidative ozonolysis" which typically uses H₂O₂ instead of Zn/H₂O, converting aldehydes to carboxylic acids.

Step 2: Understanding Reaction-2

Ethylene reacts with Baeyer's reagent (cold alkaline KMnO₄), which performs syn hydroxylation:

This forms ethylene glycol (a vicinal diol) through syn addition.

Step 3: Polymerization Reaction

Compound A (from Reaction-1) polymerizes with hexamethylene diamine. Since hexamethylene diamine is H₂N-(CH₂)₆-NH₂, A must be a dicarboxylic acid to form a polyamide.

From oxidative ozonolysis of ethylene, we get formic acid (HCOOH), but this is monofunctional. However, if we consider a different alkene that gives a diacid upon oxidative ozonolysis, but here ethylene is given. There might be a misinterpretation.

Actually, for ethylene, oxidative ozonolysis would give formic acid (HCOOH), which is not suitable for polymerization with a diamine to form a polyamide. This suggests that A might not be from ethylene, or there's a different reactant.

But based on standard knowledge, when a diacid reacts with hexamethylene diamine, it forms Nylon-6,6, a step-growth polymer.

Step 4: Analyzing the Options

Now, evaluating each option:

• Option 1: C–Nylon-6,6 – Step growth polymer → Correct. Nylon-6,6 is formed by step-growth polymerization.
• Option 2: A–Acid–Oxidative Ozonolysis → For ethylene, oxidative ozonolysis gives formic acid, which is an acid, so this might be correct, but note it's monofunctional.
• Option 3: B–Vicinal diol – Syn addition → Correct. Baeyer's reagent gives vicinal diol via syn addition.
• Option 4: C–Dacron–Chain growth polymer → Incorrect. Dacron is a polyester (polyethylene terephthalate), not formed from hexamethylene diamine. Also, it is a step-growth polymer, not chain-growth.

Final Answer

The incorrect combination is: C–Dacron–Chain growth polymer

Related Topics and Formulae

1. Ozonolysis

Ozonolysis cleaves alkenes at the double bond. General reaction:

With oxidative workup (H₂O₂), aldehydes are oxidized to carboxylic acids.

2. Baeyer's Test

Syn addition of OH groups across the double bond:

3. Polymerization Types

Step-growth polymerization: Monomers react to form dimers, trimers, etc., gradually. Example: Nylon, polyester.

Chain-growth polymerization: Involves initiation, propagation, termination. Example: Polyethylene, PVC.

4. Important Polymers

• Nylon-6,6: Made from adipic acid and hexamethylene diamine (step-growth).
• Dacron: Polyethylene terephthalate (step-growth polyester).