Q. What is the IUPAC name of CH3-CH2-CH2-CH3?
A.
Butane
B.
Propane
C.
Pentane
D.
Hexane
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Solution
The longest carbon chain has 4 carbons, so the IUPAC name is butane.
Correct Answer: A — Butane
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Q. What is the IUPAC name of CH3-CH2-CH2-CHO?
A.
Butanal
B.
Propionaldehyde
C.
Pentanal
D.
Hexanal
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Solution
The compound is a four-carbon aldehyde, hence its IUPAC name is Butanal.
Correct Answer: A — Butanal
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Q. What is the IUPAC name of CH3-CH2-CH2-COOH?
A.
Butanoic acid
B.
Propanoic acid
C.
Pentanoic acid
D.
Hexanoic acid
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Solution
The longest carbon chain contains four carbons, and the functional group is a carboxylic acid, hence the name is Butanoic acid.
Correct Answer: A — Butanoic acid
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Q. What is the IUPAC name of CH3-CH2-CHO?
A.
Ethanal
B.
Propanal
C.
Butanal
D.
Methanal
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Solution
The compound CH3-CH2-CHO is an aldehyde and is named ethanal.
Correct Answer: A — Ethanal
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Q. What is the IUPAC name of CH3-CH2-COOH?
A.
Propanoic acid
B.
Butanoic acid
C.
Acetic acid
D.
Methanoic acid
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Solution
The compound CH3-CH2-COOH has three carbon atoms and is a carboxylic acid, thus it is named propanoic acid.
Correct Answer: A — Propanoic acid
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Q. What is the IUPAC name of CH3CH2CH(OH)CH3?
A.
2-Butanol
B.
1-Butanol
C.
Propan-2-ol
D.
Butan-2-ol
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Solution
The compound is Butan-2-ol, as the hydroxyl group is on the second carbon.
Correct Answer: D — Butan-2-ol
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Q. What is the IUPAC name of CH3CH2CH2OH?
A.
Propan-1-ol
B.
Butan-1-ol
C.
Pentanol
D.
Butanol
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Solution
The compound CH3CH2CH2OH is named butan-1-ol as it has four carbon atoms and the hydroxyl group is on the first carbon.
Correct Answer: B — Butan-1-ol
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Q. What is the IUPAC name of CH3CH2OCH2CH3?
A.
Ethyl methyl ether
B.
Dimethyl ether
C.
Diethyl ether
D.
Ethyl ether
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Solution
The compound CH3CH2OCH2CH3 is named diethyl ether, as it consists of two ethyl groups bonded to an oxygen atom.
Correct Answer: C — Diethyl ether
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Q. What is the IUPAC name of CH3CHO?
A.
Ethanal
B.
Propanal
C.
Acetaldehyde
D.
Butanal
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Solution
The IUPAC name of CH3CHO is ethanal, which is also known as acetaldehyde.
Correct Answer: A — Ethanal
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Q. What is the IUPAC name of CH3COCH2CH3?
A.
Butan-2-one
B.
Butanal
C.
Propan-2-one
D.
Pentanal
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Solution
The IUPAC name of CH3COCH2CH3 is Butan-2-one, as it has a ketone functional group at the second carbon.
Correct Answer: A — Butan-2-one
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Q. What is the IUPAC name of CH3COCH2CHO?
A.
3-oxobutanal
B.
4-oxobutanal
C.
2-oxobutanal
D.
2-butanone
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Solution
The IUPAC name of CH3COCH2CHO is 3-oxobutanal.
Correct Answer: A — 3-oxobutanal
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Q. What is the IUPAC name of CH3COCH3?
A.
Propanal
B.
Butan-2-one
C.
Acetone
D.
Ethyl methyl ketone
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Solution
CH3COCH3 is known as acetone, which is the simplest ketone.
Correct Answer: C — Acetone
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Q. What is the IUPAC name of CH3COOH?
A.
Methanoic acid
B.
Ethanoic acid
C.
Propanoic acid
D.
Butanoic acid
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Solution
CH3COOH is known as Ethanoic acid in IUPAC nomenclature.
Correct Answer: B — Ethanoic acid
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Q. What is the IUPAC name of CH3NH2?
A.
Methylamine
B.
Ethylamine
C.
Propylamine
D.
Dimethylamine
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Solution
The IUPAC name of CH3NH2 is methylamine.
Correct Answer: A — Methylamine
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Q. What is the IUPAC name of the alkane with the formula C5H12?
A.
Pentane
B.
Butane
C.
Hexane
D.
Propane
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Solution
The alkane with the formula C5H12 is named Pentane.
Correct Answer: A — Pentane
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Q. What is the IUPAC name of the alkane with the formula C6H14?
A.
Hexane
B.
Pentane
C.
Heptane
D.
Octane
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Solution
The alkane with the formula C6H14 is named Hexane.
Correct Answer: A — Hexane
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Q. What is the IUPAC name of the alkene with the formula C5H10?
A.
Pentene
B.
Butene
C.
Hexene
D.
Cyclopentene
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Solution
The IUPAC name of the alkene with the formula C5H10 is pentene.
Correct Answer: A — Pentene
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Q. What is the IUPAC name of the compound CH2=CH-CH2-CH3?
A.
Butene
B.
Propene
C.
1-Butene
D.
2-Butene
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Solution
The compound CH2=CH-CH2-CH3 is named 1-Butene as the double bond is between the first and second carbon.
Correct Answer: C — 1-Butene
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Q. What is the IUPAC name of the compound CH3-CH2-CH2-CH3?
A.
Butane
B.
Propane
C.
Pentane
D.
Hexane
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Solution
The IUPAC name for CH3-CH2-CH2-CH3 is Butane.
Correct Answer: A — Butane
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Q. What is the IUPAC name of the compound CH≡C-CH2-CH3?
A.
1-butyne
B.
2-butyne
C.
1-pentyne
D.
3-pentyne
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Solution
The IUPAC name of CH≡C-CH2-CH3 is 1-butyne.
Correct Answer: A — 1-butyne
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Q. What is the IUPAC name of the compound with the formula C2H5-CO-CH3?
A.
Butan-2-one
B.
Propan-2-one
C.
Butan-1-one
D.
Propan-1-one
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Solution
The compound is a ketone with four carbons, and the carbonyl group is on the second carbon, thus it is Butan-2-one.
Correct Answer: A — Butan-2-one
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Q. What is the IUPAC name of the compound with the formula C4H6?
A.
1-butyne
B.
2-butyne
C.
Cyclobutene
D.
Butadiene
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Solution
The compound C4H6 is named 2-butyne according to IUPAC nomenclature.
Correct Answer: B — 2-butyne
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Q. What is the IUPAC name of the compound with the formula C6H5-CH2-CHO?
A.
Benzaldehyde
B.
Benzylaldehyde
C.
Phenylacetaldehyde
D.
Phenylaldehyde
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Solution
The compound has a benzyl group and an aldehyde functional group, making the correct name Benzylaldehyde.
Correct Answer: B — Benzylaldehyde
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Q. What is the IUPAC name of the compound with the formula C6H5CH3?
A.
Toluene
B.
Benzaldehyde
C.
Phenol
D.
Aniline
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Solution
The compound C6H5CH3 is known as toluene, which is a methyl-substituted derivative of benzene.
Correct Answer: A — Toluene
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Q. What is the IUPAC name of the compound with the structure CH3-CH(CH3)-C(CH3)2-CH2-CH3?
A.
2,3-Dimethylpentane
B.
3,3-Dimethylpentane
C.
2,2-Dimethylpentane
D.
3-Methylpentane
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Solution
The longest chain has 5 carbons, and there are two methyl groups on the third carbon, so the name is 3,3-Dimethylpentane.
Correct Answer: B — 3,3-Dimethylpentane
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Q. What is the Kb of ammonia (NH3) if the pKa of its conjugate acid (NH4+) is 9.25?
A.
1.8 x 10^-5
B.
5.6 x 10^-10
C.
1.0 x 10^-14
D.
3.2 x 10^-5
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Solution
Kb = Kw / Ka = 1.0 x 10^-14 / 5.6 x 10^-10 = 1.8 x 10^-5
Correct Answer: A — 1.8 x 10^-5
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Q. What is the Ksp expression for the salt Ag2SO4?
A.
Ksp = [Ag+]^2[SO4^2-]
B.
Ksp = [Ag2+]^2[SO4^2-]
C.
Ksp = [Ag+]^2[SO4^2-]^2
D.
Ksp = [Ag+]^2[SO4^2-]^3
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Solution
The solubility product constant (Ksp) for Ag2SO4 is given by Ksp = [Ag+]^2[SO4^2-] because the dissociation is Ag2SO4 ⇌ 2Ag+ + SO4^2-.
Correct Answer: A — Ksp = [Ag+]^2[SO4^2-]
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Q. What is the Ksp of AgCl if the solubility of AgCl in water is 1.0 x 10^-5 M?
A.
1.0 x 10^-10
B.
1.0 x 10^-5
C.
1.0 x 10^-15
D.
1.0 x 10^-20
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Solution
Ksp = [Ag+][Cl-] = (1.0 x 10^-5)(1.0 x 10^-5) = 1.0 x 10^-10.
Correct Answer: A — 1.0 x 10^-10
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Q. What is the limiting reagent when 3 moles of A react with 2 moles of B to produce 4 moles of C?
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Solution
The reaction requires 1.5 moles of B for 3 moles of A. Since only 2 moles of B are available, B is the limiting reagent.
Correct Answer: B — B
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Q. What is the limiting reagent when 5 moles of A react with 3 moles of B in the reaction A + 2B → C?
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Solution
The reaction requires 2 moles of B for every mole of A. For 5 moles of A, 10 moles of B are needed. Since only 3 moles of B are available, B is the limiting reagent.
Correct Answer: B — B
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