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- 1. Multiple Choice
In pyrrole and pyridine the number of electrons that the N atom contributes to n-system is
Pyrrole 2, pyridine 1
Pyrrole 1, pyridine 1
Pyrrole 2, pyridine 2
Pyrrole 1, pyridine 2
- 2. Multiple Choice
What is the correct order of reactivity most reactive first of pyrrole, furan and thiophene towards electrophiles
furan>thiophene>pyrrole
pyrrole>furan>thiophene
furan>pyrrole> Thiophene
None of above
- 3. Multiple Choice
Electrophilic substitution on furan usually occurs at:
C1
C2
C1 & C2
None of above
- 4. Multiple Choice
Nitration of pyrrole is best carried out using
Concentrated nitric acid and sulfuric acid
Acetyl nitrite
Ammonium nitrate
All of above
- 5. Multiple Choice
If you wanted to form 2,3,4,5-tetrabromopyrrole from pyrrole, which of the following conditions would be the best choice
HBr2 at 298K
Br2 with AlBr3 as a Lewis catalyst
Br2 at 273K
Br2 in presence of radical initiation
- 6. Multiple Choice
Which statement below is correct...
Pyrrole is stronger base than triethylamine
Pyrrole readily protonated on the N atom
Pyrrole is a very weak base
None of above
- 7. Multiple Choice
Which statement about thiophene is incorrect
Thiophene is polar
The S atom contributes two electrons to the n-system
Thiophene is less reactive than pyrrole
Thiophene is more reactive than pyrrole
- 8. Multiple Choice
Pyrrole undergoes sulfonation in presence of…..................to produce pyrrole-2-sulfonic acid
Conc H2SO4 + HNO3
Conc H2SO4
Dilute sulphuric acid pyridine
SO3 and ethanol
- 9. Multiple Choice
Pyrrole undergoes iodination in presence of iodine and potassium iodine to produce…
2-iodo pyrrole
3-iodo pyrrole
tetra iodo pyrrole
tri iodo pyrrole
- 10. Multiple Choice
Oxidation of pyrrole in presents of chromium oxide (Cr2O3) and acetic acid produce
Malic acid
Pyrrole-N-oxide
None of above
- 11. Multiple Choice
Pyrrole is reduced by using Zn and acetic acid to yield
2-pyrroline
3-pyrroline
Pyrrolidine
No reaction
- 12. Multiple Choice
Pyrrole is heated with …..........to open the ring and from succinaldehyde dioxime
Concentration sulphuric acid
Strong alkali with pyridine
Hydrogen cyanide with HCl
Ethanolic hydroxylamine hydrocholide
- 13. Multiple Choice
Name the heterocyclic compound present in above structure of Atorvastatin
Furan
Pyrrolidine
Pyrimidine
Pyrrole
- 14. Multiple Choice
How many delocalized pi electrons in .....
6
2
5
4
- 15. Multiple Choice
Pyrrole + CHCl3 + KOH --------> ?
- 16. Fill in the Blank
write the IUPAC name of this compound
- 17. Multiple Choice
Contains chlorophyll, which hetercyclic compound it contains
- 18. Multiple Choice
what is the correct name of this structure.....
Oxa 2, 4 cyclopentadiene
aza 2, 4 cyclopentadiene
Oxa 2, 4 cyclopantene
aza 2, 4 cyclopantene
- 19. Multiple Choice
Resonance stabilized energy of pyrrole is 22 to 28 Kcal/mole which is less than benzene
True
False
- 20. Multiple Choice
is the structure of antibiotic_______________contain pyrrole
Penicilline
Azithromycine
Erythromycine
Cephalosporine
- 21. Fill in the Blank
Write IUPAC name of
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