46 Questions
What is the correct rule for numbering a ring with multiple heteroatoms?
Start with the heteroatom that gives the lowest number to the next priority atom.
What is the reason for pyrrole having a high boiling point compared to furan and thiophene?
Presence of intermolecular hydrogen bonding.
Why is pyrrole considered an important heterocyclic compound?
Presence in naturally occurring substances like alkaloids and haemoglobin.
What does pyrrole's name 'pyrros' in Greek signify?
Oil that catches fire easily.
What determines the numbering of a ring with one heteroatom?
The distance from the fused bond.
Where does pyrrole naturally occur?
In bone oil and coal-tar.
What is the color produced when pyrrole reacts with p-dimethylaminobenzaldehyde?
Intense Red
How is pyrrole removed during the isolation process?
Fractional distillation
Which synthesis method involves the reaction of a-haloketones with β-ketoester in the presence of ammonia?
Hantzsch pyrrole synthesis
What is the primary source of pyrrole in the text?
Horns
What is used to wash the isolated bone oil to remove acidic substances?
Sulphuric acid
How are saturated atoms in a partially saturated ring typically designated?
By using 'dihydro', 'trihydro', 'tetrahydro' followed by numbers indicating the position
What is the rule followed for designating the position of fusion in benzofused compounds?
Prefix: 'benzo', Letter in square brackets, Name of heterocyclic ring
In the nomenclature of fused systems, what do the words 'dihydro', 'trihydro', 'tetrahydro' indicate?
Number of saturated atoms in the compound
How should substituents in a heterocyclic compound be listed?
In alphabetical order following identification by position
What is a nonsystematic name given to an organic compound?
Trivial name
How is the highest priority atom indicated in naming heterocyclic compounds?
#1 followed by next priority atom with lowest number
What is the primary importance of heterocyclic compounds?
All of the above
Which of the following is an example of a heterocyclic compound used as a drug?
All of the above
Which of the following is NOT a common heterocyclic ring system?
Seven-membered N-heterocyclic rings
What type of heterocyclic rings contain oxygen as the heteroatom?
O-heterocyclic rings
In the nomenclature of heterocyclic compounds, what is considered when naming monoheterocyclic compounds with more than one heteroatom?
All of the above
Which of the following heterocyclic ring systems is NOT mentioned in the text?
Seven-membered O-heterocyclic rings
What is the primary source of pyrrole in the text?
Bones
In the Ehrlich Test, what color is produced when pyrrole reacts with p-dimethylaminobenzaldehyde?
Intense Red
How is pyrrole removed during the isolation process?
Boiling with KOH
Which synthesis method involves the reaction of a-haloketones with β-ketoester in the presence of ammonia?
Hantzsch pyrrole synthesis
What is used to wash the isolated bone oil to remove basic substances?
Sulphuric acid
Which of the following is NOT mentioned as an importance of heterocyclic compounds in the text?
Used in the synthesis of polymers
Which of the following classes of heterocyclic rings is NOT mentioned in the text?
P-heterocyclic rings
What is the primary consideration when naming monoheterocyclic compounds with more than one heteroatom?
The type of heteroatoms
Which of the following heterocyclic compounds is mentioned as being used as a drug?
Quinolone
Based on the information provided, which of the following statements about the nomenclature of heterocyclic compounds is correct?
Saturated atoms in a partially saturated ring are typically designated with a number
Which of the following heterocyclic ring systems is considered a fused ring?
Indole
Which statement correctly describes the rule for indicating the position of hetero atoms in heterocyclic compounds?
The highest priority atom is #1 and numbering proceeds in a direction that gives the next priority atom the lowest number.
How are saturated atoms in a partially saturated heterocyclic ring designated?
By the letter 'H' followed by the number of the saturated atom.
What is the correct order for listing substituents on a heterocyclic compound?
Substituents should be listed in alphabetical order, preceded by the number of the atom they are attached to.
What does the prefix 'benzo' indicate in the nomenclature of benzofused heterocyclic compounds?
The presence of a benzene ring fused to the heterocyclic ring.
What rule is followed for designating the position of fusion in benzofused heterocyclic compounds?
The position of fusion is designated by a letter in square brackets indicating the atom of the heterocyclic ring to which the benzene ring is fused.
What is a 'trivial name' in the context of heterocyclic compounds?
A nonsystematic name that does not follow IUPAC rules.
What is the molecular formula of pyrrole?
C4H5N
Why does pyrrole have a relatively high boiling point compared to furan and thiophene?
Due to the presence of intermolecular hydrogen bonding in pyrrole
Which of the following is the correct rule for numbering a ring with one heteroatom?
The heteroatom is #1, and numbering continues in the direction that is closer to the fused bond
What is the rule for numbering a ring with more than one heteroatom?
The highest priority atom is #1, and numbering continues in the direction that gives the next priority atom the lowest number
How are the bonds of the heterocyclic ring assigned?
By alphabetical letters starting with the 1,2-bond
What does the name 'pyrrole' originate from?
The Greek word 'pyrros' meaning fiery oil
Explore the fundamentals of organic chemistry focusing on heterocyclic compounds, including an introduction, importance, common rings, and nomenclature. Dive into the study of Pyrrole and its significance in the field of chemistry.
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