NEET Practice Questions (MCQs) with Answers & Solutions

A copolymer is a polymer derived from more than one species of monomer. The polymerization of monomers into copolymers is called copolymerization

Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid.

Terylene is a synthetic polyester fibre produced by polymerizing ethylene glycol and terephthelic acid 

Buna-S is a synthetic rubber formed by co-polymerization or emulsion polymerization of a mixture of 1:3 butadiene and styrene

Mass of the compound = 0.2

Mass of CO₂ formed = 0.44

Percentage formed = 0.44

Percentage of

$$\begin{gathered} \mathrm{C}=\frac{12}{44}\times \frac{\mathrm{Mass} \mathrm{of} {\mathrm{CO}}_2 \mathrm{formed}}{\mathrm{Mass} \mathrm{of} \mathrm{QC}} \times 100 \\ = \frac{12}{44}\times \frac{0.44}{0.2}\times 100 \\ = 60\% \end{gathered}$$

Natural rubber is a polymer of Isoprene

D-Mannose is an epimer of D-glucose because the two sugars differ only in the configuration at C-2 .

When a molecule such as glucose converts to a cyclic form, it generates a new chiral centre at C-1 .

Anomers are special cases — they are epimers that differ in configuration only at the anomeric carbon

(d) Acetate rayon (cellulose acetate) is semisynthetic polymer obtained by using natural polymer cellulose by producing modifications by artificial means.

 The vulcanisation of rubber makes it elastic and strengthened.

(b) Terylene or dacron is a polyester of ethylene glycol and dimethyl terephthalate.

(d) Thermosets plastics are highly cross linked materials with infusible mass called resins. These are characteristics of thermosets e.g. Bakelite Vulcanised rubber.

(d) All are the characteristics and example of terpolymer.