Chemistry (School & UG)
Q. What is the IUPAC name of CH3CH2Br?
A.
Bromoethane
B.
Ethyl bromide
C.
Bromomethane
D.
Ethane bromide
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Solution
The correct IUPAC name for CH3CH2Br is Bromoethane, as it consists of a two-carbon chain with a bromine substituent.
Correct Answer: A — Bromoethane
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Q. What is the IUPAC name of CH3CH2OH?
A.
Ethanol
B.
Methanol
C.
Propanol
D.
Butanol
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Solution
The compound CH3CH2OH is an alcohol with two carbon atoms, which is named ethanol.
Correct Answer: A — Ethanol
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Q. What is the IUPAC name of the compound CH3-CH2-CH(CH3)-CH2-Br?
A.
1-bromobutane
B.
2-bromobutane
C.
3-bromobutane
D.
1-bromo-2-methylpropane
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Solution
The longest carbon chain has four carbons, and the bromine is attached to the second carbon, making the IUPAC name 2-bromobutane.
Correct Answer: B — 2-bromobutane
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Q. What is the IUPAC name of the compound CH3-CH2-CH2-CH=CH2?
A.
1-pentene
B.
2-pentene
C.
3-pentene
D.
1-butene
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Solution
The longest carbon chain contains 5 carbons with a double bond at the first carbon, making it 1-pentene.
Correct Answer: A — 1-pentene
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Q. What is the IUPAC name of the compound CH3-CH2-NH2?
A.
Ethylamine
B.
Propylamine
C.
Dimethylamine
D.
Isopropylamine
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Solution
The compound CH3-CH2-NH2 is named ethylamine according to IUPAC nomenclature.
Correct Answer: A — Ethylamine
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Q. What is the IUPAC name of the compound formed when benzene undergoes sulfonation with sulfuric acid?
A.
Benzene sulfonic acid
B.
Benzene thiosulfate
C.
Benzene sulfate
D.
Benzene disulfide
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Solution
The product is benzene sulfonic acid, formed by the addition of a sulfonyl group to the benzene ring.
Correct Answer: A — Benzene sulfonic acid
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Q. What is the IUPAC name of the compound formed when phenol is treated with acetic anhydride?
A.
Acetophenone
B.
Phenyl acetate
C.
Benzyl acetate
D.
Phenyl acetic acid
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Solution
The compound formed is acetophenone, which results from the acetylation of phenol.
Correct Answer: A — Acetophenone
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Q. What is the IUPAC name of the compound formed when phenol undergoes bromination?
A.
Bromophenol
B.
2-Bromophenol
C.
4-Bromophenol
D.
Bromobenzene
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Solution
Bromination of phenol typically occurs at the ortho or para positions, with 2-bromophenol being one of the major products.
Correct Answer: B — 2-Bromophenol
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Q. What is the IUPAC name of the compound with the formula C3H6O?
A.
Propanal
B.
Propan-2-one
C.
Cyclopropanol
D.
Propene
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Solution
The compound C3H6O can be identified as a ketone, specifically Propan-2-one, which has the carbonyl group on the second carbon.
Correct Answer: B — Propan-2-one
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Q. What is the IUPAC name of the compound with the formula C4H10O that has a branched structure?
A.
Butanol
B.
2-Butanol
C.
Butoxyethane
D.
1-Butanol
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Solution
The compound with the formula C4H10O and a branched structure is 2-Butanol, which has the hydroxyl group (-OH) on the second carbon.
Correct Answer: B — 2-Butanol
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Q. What is the IUPAC name of the compound with the formula C4H9Br?
A.
1-bromobutane
B.
2-bromobutane
C.
1-bromo-2-methylpropane
D.
2-bromo-2-methylpropane
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Solution
The compound with the formula C4H9Br is 1-bromobutane, as it is a straight-chain brominated alkane.
Correct Answer: A — 1-bromobutane
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Q. What is the IUPAC name of the compound with the formula C5H10O that contains a ketone functional group?
A.
2-Pentanone
B.
3-Pentanone
C.
1-Pentanone
D.
Pentanal
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Solution
The compound is a ketone with five carbon atoms. The longest carbon chain is pentane, and the ketone group is on the second carbon, making it 2-Pentanone.
Correct Answer: A — 2-Pentanone
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Q. What is the IUPAC name of the compound with the formula C5H10O?
A.
Pentanal
B.
2-Pentanone
C.
Pentanol
D.
Cyclopentanol
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Solution
The compound C5H10O can be a ketone, and the longest carbon chain with the carbonyl group is 5 carbons long, making it 2-Pentanone.
Correct Answer: B — 2-Pentanone
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Q. What is the IUPAC name of the compound with the formula C5H12?
A.
Pentane
B.
Butane
C.
Hexane
D.
Propane
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Solution
The compound C5H12 is an alkane with five carbon atoms, which is named pentane.
Correct Answer: A — Pentane
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Q. What is the IUPAC name of the compound with the formula C6H5-CH2-COOH?
A.
Benzyl acetic acid
B.
Phenylacetic acid
C.
Benzenepropanoic acid
D.
Benzeneacetic acid
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Solution
The correct IUPAC name is phenylacetic acid, as it has a phenyl group attached to the acetic acid structure.
Correct Answer: B — Phenylacetic acid
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Q. What is the IUPAC name of the compound with the formula C6H5-CO-CH3?
A.
Acetophenone
B.
Benzophenone
C.
Phenylacetone
D.
Benzylacetone
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Solution
The compound is acetophenone, which consists of a phenyl group attached to a carbonyl group and a methyl group.
Correct Answer: A — Acetophenone
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Q. What is the IUPAC name of the compound with the formula C6H5CH2COOH?
A.
Benzyl acetic acid
B.
Phenylacetic acid
C.
Benzenepropanoic acid
D.
Benzeneacetic acid
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Solution
The correct IUPAC name is phenylacetic acid, as it contains a phenyl group attached to an acetic acid moiety.
Correct Answer: B — Phenylacetic acid
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Q. What is the IUPAC name of the compound with the formula C6H5CH2OH?
A.
Benzyl alcohol
B.
Phenol
C.
Benzene-1-ol
D.
Benzeneethanol
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Solution
The IUPAC name of C6H5CH2OH is benzyl alcohol, which consists of a benzene ring attached to a -CH2OH group.
Correct Answer: A — Benzyl alcohol
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Q. What is the IUPAC name of the compound with the formula C6H5NO2?
A.
Nitrobenzene
B.
Aniline
C.
Benzamide
D.
Benzonitrile
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Solution
The IUPAC name of C6H5NO2 is nitrobenzene, which contains a nitro group (-NO2) attached to a benzene ring.
Correct Answer: A — Nitrobenzene
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Q. What is the IUPAC name of the compound with the formula CH3-CH(CH3)-CH2-CHO?
A.
3-methylbutanal
B.
2-methylbutanal
C.
4-methylbutanal
D.
2-methylpropanal
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Solution
The longest carbon chain contains 4 carbons, and the aldehyde group is at the end, making it 3-methylbutanal.
Correct Answer: A — 3-methylbutanal
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Q. What is the IUPAC name of the compound with the formula CH3-CH2-CH(CH3)-CH2-Br?
A.
1-bromo-3-methylbutane
B.
2-bromo-3-methylbutane
C.
3-bromo-2-methylbutane
D.
2-bromo-4-methylbutane
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Solution
The longest carbon chain has four carbons, and the bromine is on the first carbon, making it 1-bromo-3-methylbutane.
Correct Answer: B — 2-bromo-3-methylbutane
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Q. What is the IUPAC name of the compound with the formula CH3-CH2-CH(CH3)-CH2-CH3?
A.
2-pentyl
B.
3-methylpentane
C.
2-methylpentane
D.
3-pentyl
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Solution
The longest carbon chain has five carbons, and the methyl group is on the third carbon, making it 3-methylpentane.
Correct Answer: B — 3-methylpentane
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Q. What is the IUPAC name of the compound with the formula [Co(NH3)5Cl]Cl2?
A.
Pentaamminechlorocobalt(III) chloride
B.
Chloropentaamminecobalt(II) chloride
C.
Pentaamminecobalt(II) chloride
D.
Pentaamminechlorocobalt(II) chloride
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Solution
The complex has a cobalt ion in the +3 oxidation state, and the correct IUPAC name is Pentaamminechlorocobalt(III) chloride.
Correct Answer: A — Pentaamminechlorocobalt(III) chloride
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Q. What is the IUPAC name of the compound with the structure C6H5-CH2-COOH?
A.
Benzyl acetic acid
B.
Phenylacetic acid
C.
Benzenepropanoic acid
D.
Benzeneacetic acid
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Solution
The correct IUPAC name is phenylacetic acid, as it consists of a phenyl group attached to an acetic acid moiety.
Correct Answer: B — Phenylacetic acid
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Q. What is the IUPAC name of the compound with the structure CH3-CH(CH3)-C(=O)-OH?
A.
2-methylbutanoic acid
B.
3-methylbutanoic acid
C.
2-methylpropanoic acid
D.
3-methylpropanoic acid
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Solution
The compound is a carboxylic acid with a methyl group on the second carbon, making it 2-methylbutanoic acid.
Correct Answer: A — 2-methylbutanoic acid
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Q. What is the IUPAC name of the compound with the structure CH3-CH(CH3)-CH2-CH3?
A.
2-methylbutane
B.
3-methylbutane
C.
2-pentene
D.
2-butene
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Solution
The longest carbon chain has 4 carbons (butane) with a methyl group on the second carbon, making it 2-methylbutane.
Correct Answer: A — 2-methylbutane
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Q. What is the IUPAC name of the compound with the structure CH3-CH2-CH(CH3)-Br?
A.
1-bromo-2-methylpropane
B.
2-bromo-3-methylbutane
C.
3-bromobutane
D.
1-bromo-3-methylbutane
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Solution
The correct IUPAC name is 1-bromo-2-methylpropane, as the longest carbon chain has three carbons and the bromine is on the first carbon.
Correct Answer: A — 1-bromo-2-methylpropane
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Q. What is the IUPAC name of the compound with the structure of a benzene ring with a nitro group and a methyl group at the 1 and 2 positions respectively?
A.
2-Nitrotoluene
B.
1-Nitrotoluene
C.
2-Methyl-1-nitrobenzene
D.
1-Methyl-2-nitrobenzene
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Solution
The correct IUPAC name is 1-Methyl-2-nitrobenzene, indicating the positions of the substituents on the benzene ring.
Correct Answer: D — 1-Methyl-2-nitrobenzene
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Q. What is the IUPAC name of the compound [Cr(NH3)6]Cl3?
A.
Hexaammonium chromium(III) chloride
B.
Hexaammonia chromium(III) chloride
C.
Hexaammine chromium(III) chloride
D.
Hexaammonium chromium(II) chloride
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Solution
The correct IUPAC name is Hexaammine chromium(III) chloride, where 'ammine' indicates the ammonia ligands and chromium is in the +3 oxidation state.
Correct Answer: C — Hexaammine chromium(III) chloride
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Q. What is the main advantage of high-performance liquid chromatography (HPLC) over traditional liquid chromatography?
A.
Higher resolution and speed
B.
Lower cost of operation
C.
Simpler instrumentation
D.
Use of larger sample volumes
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Solution
HPLC offers higher resolution and speed due to the use of high pressure to push solvents through the column, allowing for better separation of components.
Correct Answer: A — Higher resolution and speed
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