Module 7 chem 219 Portage (Final exam prep)
Latest Update 2025-2026 85 Questions and 100%
Verified Correct Answers Guaranteed A+
3 isomeric forms of diazines -CORRECT ANSWER: 1. pyridazine N1, N2
2.pyrimidine N1, N3
3.pyrazine N1, N4
5-membered heterocycles -CORRECT ANSWER: furan, pyrrole, thiophene
-aromatic/ behave like benzene
-EAS reactions
-Flat/planar geometry
atomic structure of pyridine -CORRECT ANSWER: sp2 hybridized atoms, 6 P electrons
just like benzene
Azine -CORRECT ANSWER: heterocyclic 6-membered rings with 2 or more nitrogen
atoms as part of the ring system
Azole -CORRECT ANSWER: more than one heteroatom in a 5-membered heterocycle
Biggest difference between benzene and membered aromatic rings? -CORRECT
ANSWER: The heteroatom of a 5-membered ring contributes 2 electrons (1 lone pair) to
the aromatic system while the 6-membered heterocycles' heteroatom only contributes 1
electron to the aromatic system
BP of pyridine vs benzene? why? -CORRECT ANSWER: -pyridine has a higher BP than
benzene even though they have a similar weight
, -why? dipole/dipole forces
Diazines -CORRECT ANSWER: 2 nitrogens replacing carbons in a benzene ring
Difference in Furan and Thiophene compared to pyrrole -CORRECT ANSWER: Furan
and thiophene have 2 lone pairs instead of one which leaves one lone pair for
protonations after the other is used in the aromatic pi system
furan -CORRECT ANSWER: oxygen-based 5-membered aromatic ring
fused-ring system -CORRECT ANSWER: a molecule in which two or more rings share
two adjacent carbon atoms
geometry of pyridine -CORRECT ANSWER: flat/ planar geometry with 120 degree bond
angles
Heteroatoms -CORRECT ANSWER: Atoms in an organic compound other than carbon
and hydrogen
Ex: Oxygen, Nitrogen, Sulfur
Heterocycles -CORRECT ANSWER: cyclic organic molecule where one or more carbon
atoms are replaced by heteroatoms
Imidazole -CORRECT ANSWER: nitrogen at 1, nitrogen at 3
Imidazole is found in: -CORRECT ANSWER: histidine (amino acid)
indole -CORRECT ANSWER: benzene + pyrrole
found in amino acid tryptophan
Latest Update 2025-2026 85 Questions and 100%
Verified Correct Answers Guaranteed A+
3 isomeric forms of diazines -CORRECT ANSWER: 1. pyridazine N1, N2
2.pyrimidine N1, N3
3.pyrazine N1, N4
5-membered heterocycles -CORRECT ANSWER: furan, pyrrole, thiophene
-aromatic/ behave like benzene
-EAS reactions
-Flat/planar geometry
atomic structure of pyridine -CORRECT ANSWER: sp2 hybridized atoms, 6 P electrons
just like benzene
Azine -CORRECT ANSWER: heterocyclic 6-membered rings with 2 or more nitrogen
atoms as part of the ring system
Azole -CORRECT ANSWER: more than one heteroatom in a 5-membered heterocycle
Biggest difference between benzene and membered aromatic rings? -CORRECT
ANSWER: The heteroatom of a 5-membered ring contributes 2 electrons (1 lone pair) to
the aromatic system while the 6-membered heterocycles' heteroatom only contributes 1
electron to the aromatic system
BP of pyridine vs benzene? why? -CORRECT ANSWER: -pyridine has a higher BP than
benzene even though they have a similar weight
, -why? dipole/dipole forces
Diazines -CORRECT ANSWER: 2 nitrogens replacing carbons in a benzene ring
Difference in Furan and Thiophene compared to pyrrole -CORRECT ANSWER: Furan
and thiophene have 2 lone pairs instead of one which leaves one lone pair for
protonations after the other is used in the aromatic pi system
furan -CORRECT ANSWER: oxygen-based 5-membered aromatic ring
fused-ring system -CORRECT ANSWER: a molecule in which two or more rings share
two adjacent carbon atoms
geometry of pyridine -CORRECT ANSWER: flat/ planar geometry with 120 degree bond
angles
Heteroatoms -CORRECT ANSWER: Atoms in an organic compound other than carbon
and hydrogen
Ex: Oxygen, Nitrogen, Sulfur
Heterocycles -CORRECT ANSWER: cyclic organic molecule where one or more carbon
atoms are replaced by heteroatoms
Imidazole -CORRECT ANSWER: nitrogen at 1, nitrogen at 3
Imidazole is found in: -CORRECT ANSWER: histidine (amino acid)
indole -CORRECT ANSWER: benzene + pyrrole
found in amino acid tryptophan
