Chemistry (School & UG)
Q. What is the IUPAC name for the compound with the formula C5H12?
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A.
Pentane
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B.
Butane
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C.
Hexane
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D.
Propane
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 for the compound with the formula C6H10 that contains a double bond?
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A.
1-hexene
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B.
2-hexene
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C.
cyclohexene
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D.
3-hexene
Solution
C6H10 can be a cyclic compound with a double bond, making it cyclohexene.
Correct Answer: C — cyclohexene
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Q. What is the IUPAC name for the compound with the formula C6H12O2 that is derived from hexanoic acid and ethanol?
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A.
Ethyl hexanoate
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B.
Hexyl acetate
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C.
Hexanoic acid
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D.
Hexanol
Solution
The compound is an ester formed from hexanoic acid and ethanol, making it ethyl hexanoate.
Correct Answer: A — Ethyl hexanoate
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Q. What is the IUPAC name for the compound with the formula C6H12O?
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A.
Hexanal
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B.
Hexanol
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C.
Cyclohexanol
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D.
2-Hexanol
Solution
C6H12O corresponds to hexanol, which is an alcohol with six carbon atoms.
Correct Answer: B — Hexanol
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Q. What is the IUPAC name for the compound with the formula C6H5CH2Br?
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A.
Bromobenzyl
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B.
Benzyl bromide
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C.
Bromomethylbenzene
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D.
Bromobenzene
Solution
The correct IUPAC name for C6H5CH2Br is Benzyl bromide, as it consists of a benzyl group with a bromine substituent.
Correct Answer: B — Benzyl bromide
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Q. What is the IUPAC name for the compound with the formula CH3-CH(CH3)-CH2-CH3?
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A.
2-Methylbutane
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B.
3-Methylbutane
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C.
Butane
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D.
Pentane
Solution
The longest carbon chain has four carbons (butane), and there is 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 for the compound with the formula CH3-CH2-CH(CH3)-CH2-CH3?
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A.
2-Pentanol
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B.
3-Methylpentane
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C.
2-Methylpentane
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D.
Pentane
Solution
The longest carbon chain has five carbons, and there is a methyl group on the third carbon, making the IUPAC name 3-Methylpentane.
Correct Answer: B — 3-Methylpentane
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Q. What is the IUPAC name for the compound with the formula CH3-CH2-CH(Cl)-CH3?
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A.
1-chlorobutane
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B.
2-chlorobutane
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C.
3-chlorobutane
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D.
butyl chloride
Solution
The compound is a four-carbon chain with a chlorine substituent on the second carbon, making it 2-chlorobutane.
Correct Answer: B — 2-chlorobutane
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Q. What is the IUPAC name for the compound with the formula CH3-CH2-COOH?
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A.
Propanoic acid
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B.
Butanoic acid
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C.
Acetic acid
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D.
Isobutyric acid
Solution
The compound is a three-carbon carboxylic acid, which is named propanoic acid according to IUPAC nomenclature.
Correct Answer: A — Propanoic acid
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Q. What is the IUPAC name for the compound with the formula CH₃COOH?
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A.
Acetic acid
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B.
Ethanoic acid
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C.
Propanoic acid
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D.
Butanoic acid
Solution
The IUPAC name for CH₃COOH is ethanoic acid, commonly known as acetic acid.
Correct Answer: B — Ethanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CH(CH3)-C(=O)-OH?
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A.
3-methylbutanoic acid
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B.
2-methylbutanoic acid
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C.
3-methylbutanal
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D.
2-methylbutanal
Solution
The compound is a carboxylic acid with a four-carbon chain and a methyl group on the second carbon, hence 2-methylbutanoic acid.
Correct Answer: B — 2-methylbutanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CH(CH3)-C(CH3)2-CH3?
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A.
2,3,3-trimethylbutane
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B.
2,2,3-trimethylbutane
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C.
3,3-dimethylpentane
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D.
2,4-dimethylpentane
Solution
The longest chain has 4 carbons, and there are three methyl groups on the second and third carbons.
Correct Answer: B — 2,2,3-trimethylbutane
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Q. What is the IUPAC name for the compound with the structure CH3-CH(CH3)-CH2-CH(CH3)-CH3?
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A.
2,3-dimethylpentane
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B.
3,3-dimethylpentane
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C.
2,4-dimethylpentane
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D.
3-methylhexane
Solution
The longest carbon chain has 5 carbons, and there are two methyl groups on the second and third carbons.
Correct Answer: B — 3,3-dimethylpentane
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Q. What is the IUPAC name for the compound with the structure CH3-CH(CH3)-CH2-CH3?
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A.
2-methylbutane
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B.
3-methylbutane
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C.
2-pentene
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D.
1-butene
Solution
The longest chain has 4 carbons 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 for the compound with the structure CH3-CH2-CH(CH3)-CH2-Br?
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A.
1-bromo-3-methylbutane
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B.
2-bromo-3-methylbutane
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C.
3-bromo-2-methylbutane
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D.
2-bromo-2-methylbutane
Solution
The longest carbon chain has four carbons, and the bromine is on the second carbon, making the correct IUPAC name 2-bromo-3-methylbutane.
Correct Answer: B — 2-bromo-3-methylbutane
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-CH2-CH3?
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A.
3-methylpentane
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B.
2-methylpentane
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C.
4-methylpentane
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D.
2-pentanol
Solution
The longest chain has 5 carbons, and the methyl group is on the third carbon, making it 3-methylpentane.
Correct Answer: A — 3-methylpentane
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-NH2?
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A.
Butanamine
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B.
Butan-1-amine
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C.
1-Butanamine
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D.
Butylamine
Solution
The compound is a straight-chain amine with four carbons, making it Butan-1-amine.
Correct Answer: B — Butan-1-amine
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CHO?
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A.
Butanal
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B.
Pentanal
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C.
Propionaldehyde
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D.
Butyric acid
Solution
The compound has four carbons and an aldehyde functional group, making it Butanal.
Correct Answer: A — Butanal
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CO-CH3?
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A.
Pentanal
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B.
2-Pentanone
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C.
3-Pentanone
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D.
Butan-2-one
Solution
The compound has five carbon atoms and a ketone functional group at the second carbon, making it 2-Pentanone.
Correct Answer: B — 2-Pentanone
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CO-NH2?
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A.
Butanamide
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B.
Butanoic acid
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C.
Propionamide
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D.
Pentanoic acid
Solution
The compound has a four-carbon chain with an amide functional group, making it Butanamide.
Correct Answer: A — Butanamide
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-NH2?
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A.
Propylamine
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B.
Butylamine
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C.
Ethylamine
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D.
Isopropylamine
Solution
The compound has three carbon atoms and an amine functional group, making it propylamine.
Correct Answer: A — Propylamine
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-C≡C-CH3?
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A.
1-Pentyne
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B.
2-Pentyne
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C.
3-Pentyne
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D.
Butyne
Solution
The compound is named 2-pentyne because the triple bond is located between the second and third carbon atoms.
Correct Answer: B — 2-Pentyne
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Q. What is the IUPAC name for the compound with the structure CH3-CH=CH-CH2-CH3?
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A.
1-pentene
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B.
2-pentene
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C.
3-pentene
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D.
butene
Solution
The longest carbon chain containing the double bond has 5 carbons, and the double bond starts at the second carbon, making it 2-pentene.
Correct Answer: B — 2-pentene
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Q. What is the IUPAC name for the compound with the structure CH3-CO-CH2-CH3?
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A.
Butan-2-one
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B.
Butan-1-one
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C.
Pentanal
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D.
2-Pentanone
Solution
The compound has a ketone functional group on the second carbon of a four-carbon chain, making it butan-2-one.
Correct Answer: A — Butan-2-one
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Q. What is the IUPAC name for the compound with the structure CH≡C-CH2-CH3?
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A.
1-butyne
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B.
2-butyne
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C.
1-pentyne
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D.
3-butyne
Solution
The compound is 1-butyne, as the triple bond is between the first and second carbon.
Correct Answer: A — 1-butyne
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Q. What is the IUPAC name for the polymer formed from the monomer 1,3-butadiene?
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A.
Polybutadiene
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B.
Polybuta-1,3-diene
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C.
Poly(1,3-butadiene)
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D.
Polybutylene
Solution
The correct IUPAC name for the polymer formed from 1,3-butadiene is Poly(1,3-butadiene), which indicates the structure of the repeating unit.
Correct Answer: C — Poly(1,3-butadiene)
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Q. What is the IUPAC name for the polymer formed from the monomer styrene?
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A.
Polystyrene
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B.
Polyethylene
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C.
Polypropylene
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D.
Polyvinyl chloride
Solution
The polymer formed from the monomer styrene is called polystyrene, which is widely used in various applications.
Correct Answer: A — Polystyrene
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Q. What is the IUPAC name for the simplest sugar, C6H12O6?
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A.
Fructose
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B.
Glucose
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C.
Galactose
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D.
Sucrose
Solution
The simplest sugar with the formula C6H12O6 is glucose, which is a hexose monosaccharide.
Correct Answer: B — Glucose
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Q. What is the IUPAC name of CH3-CH2-CH(OH)-CH3?
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A.
1-butanol
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B.
2-butanol
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C.
3-butanol
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D.
butan-1-ol
Solution
The compound has a hydroxyl group (-OH) on the second carbon of a four-carbon chain, making it 2-butanol.
Correct Answer: B — 2-butanol
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Q. What is the IUPAC name of CH3-CH=CH-CH2-CH3?
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A.
1-Pentene
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B.
2-Pentene
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C.
3-Pentene
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D.
Butene
Solution
The longest carbon chain containing the double bond has five carbons, and the double bond starts at the second carbon, making it 2-Pentene.
Correct Answer: B — 2-Pentene
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