Molecular Mass Of Polymers

Step 1: Understanding melamine plastic. Melamine plastic is a thermosetting polymer known for its high durability, heat resistance, and lightweight nature, commonly used in kitchenware and crockery.
Step 2: Identifying the copolymer composition. Melamine-formaldehyde resin is formed by the polymerization of melamine and formaldehyde (HCHO). The reaction results in a cross-linked polymer network that gives melamine plastic its strong and heat-resistant properties:
Step 3: Eliminating incorrect Option.
- Option A: Correct, as melamine plastic is made from melamine and formaldehyde.
- Option B: Incorrect, since ethylene is not involved in melamine plastic formation.
- Option C: Incorrect, as ethylene does not participate in this polymerization.
- Option D: Incorrect, since melamine plastic is a known polymer of melamine and formaldehyde.
Hence, the correct answer is (A) and melamine.

Step 1: Understanding ether synthesis methods. Ethers ( ) can be synthesized by several methods, but the Williamson Ether Synthesis is the most reliable and widely used approach.
Step 2: Identifying the correct reaction. - The Williamson Ether Synthesis involves the reaction of a sodium alkoxide ( ) with a primary alkyl halide or alkyl sulfonate ( ).
- The given reaction in option C follows this method, where a sodium alkoxide reacts with an alkyl sulfonate to form an ether under mild heating.
Step 3: Eliminating incorrect Option.
- Option A: Involves a benzyl bromide derivative, which may lead to side reactions.
- Option B: Though nucleophilic substitution can form ethers, it is not as general or effective as the Williamson method.
- Option D: The acid-catalyzed dehydration of alcohol at high temperature (443 K, using ) is used to form ethers, but this method is not ideal for unsymmetrical ethers and works mainly for primary alcohols.
Thus, the correct answer is (C) Williamson Ether Synthesis with alkoxide and alkyl sulfonate.