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WorksheetsHeterocyclic Compounds Unit III
Total questions: 21
Worksheet time: 16mins
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
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
Electrophilic substitution on furan usually occurs at:
C1
C2
C1 & C2
None of above
Nitration of pyrrole is best carried out using
Concentrated nitric acid and sulfuric acid
Acetyl nitrite
Ammonium nitrate
All of above
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
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
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
Pyrrole undergoes sulfonation in presence of…..................to produce pyrrole-2-sulfonic acid
Conc H2SO4 + HNO3
Conc H2SO4
Dilute sulphuric acid pyridine
SO3 and ethanol
Pyrrole undergoes iodination in presence of iodine and potassium iodine to produce…
2-iodo pyrrole
3-iodo pyrrole
tetra iodo pyrrole
tri iodo pyrrole
Oxidation of pyrrole in presents of chromium oxide (Cr2O3) and acetic acid produce
Malic acid
Pyrrole-N-oxide
None of above
Pyrrole is reduced by using Zn and acetic acid to yield
2-pyrroline
3-pyrroline
Pyrrolidine
No reaction
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
Name the heterocyclic compound present in above structure of Atorvastatin
Furan
Pyrrolidine
Pyrimidine
Pyrrole
How many delocalized pi electrons in .....
6
2
5
4
Pyrrole + CHCl3 + KOH --------> ?
write the IUPAC name of this compound
(a)
Contains chlorophyll, which hetercyclic compound it contains
what is the correct name of this structure.....
Oxa 2, 4 cyclopentadiene
aza 2, 4 cyclopentadiene
Oxa 2, 4 cyclopantene
aza 2, 4 cyclopantene
Resonance stabilized energy of pyrrole is 22 to 28 Kcal/mole which is less than benzene
True
False
is the structure of antibiotic_______________contain pyrrole
Penicilline
Azithromycine
Erythromycine
Cephalosporine
Write IUPAC name of
(a)
