Organic Chemistry Practice Test 10

1. Which of the following copolymers is the copolymer with sequence of monomer residues follows a statistical rule?

Block copolymer

Periodic copolymer

Alternating copolymer

Statistical copolymer

2. By which of the following agent there will be incomplete reduction of pyridine?

Na-NH₂, EtOH

H₂/RaNi, 200℃

Na/C₂H₅OH

NaBH₃

3. Which of the following is the structure of the radical intermediate formed in the first propagation step of the polymerization of methyl methacrylate?

organic-chemistry-questions-answers-free-radical-vinyl-polymerisation-q9a

organic-chemistry-questions-answers-free-radical-vinyl-polymerisation-q9b

organic-chemistry-questions-answers-free-radical-vinyl-polymerisation-q9d

organic-chemistry-questions-answers-free-radical-vinyl-polymerisation-q9c

4. How does the reaction rate vary with increasing extent of reaction beyond 94% conversion in self catalyzed reaction?

remains same

decreases

first increases than decreases

increases

5. How many number of resonating structure stabilises a pyridine molecule?

6. Which of the following is the product for the below reaction?

4-amino -pyridine-5-sulphonic acid

4- amino -pyridine-3-sulphonic acid

4- amino -pyridine-2-sulphonic acid

4- amino -pyridine-6-sulphonic acid

7. Which of the following reagents may be used to initiate radical polymerization of styrene?

HCl

Hydroxide ion

BF₃

Peroxides

8. Which of the following is not true about step growth polymerisation?

Similar steps repeated throughout reaction process

Rapid loss of monomer early in the reaction

Molar mass of backbone chain increases rapidly at early stage and remains approximately the same throughout the polymerization

Initiator are required for the step growth polymerisation

9. What is the reactivity order in the following five membered heterocyclic compounds?

Pyrrole

Thiophene

Pyridine

Furan

10. Which of the following is true about Step-growth polymerisation?

monomers react by eliminating small molecules like H₂O, NH₃, CH₂O and NaCl in a repetitive manner, Indefinite growth of the polymer occurs at both ends

polymerization that is catalysed by transition metal salts and complexes

radical, coordination, anionic, or cationic polymerization, depending on the type of initiation

monomers react to form first dimers, then trimmers, longer oligomers and eventually long chain polymers