Q. Which of the following is the correct IUPAC name for the compound with the formula C2H5-CHO?
A.
Ethanal
B.
Propionaldehyde
C.
Acetaldehyde
D.
Butanal
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Solution
The compound is an aldehyde with two carbons, and its IUPAC name is Acetaldehyde.
Correct Answer: C — Acetaldehyde
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Q. Which of the following is the correct IUPAC name for 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 attached to an aldehyde, making it Benzylaldehyde.
Correct Answer: B — Benzylaldehyde
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Q. Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-COOH?
A.
3-Methylbutanoic acid
B.
2-Methylbutanoic acid
C.
Butanoic acid
D.
Pentanoic acid
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Solution
The longest chain has four carbons with a methyl group on the second carbon, hence it is named 2-Methylbutanoic acid.
Correct Answer: B — 2-Methylbutanoic acid
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Q. Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-CHO?
A.
Butanal
B.
Pentanal
C.
Hexanal
D.
Heptanal
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Solution
The compound is an aldehyde with five carbons, hence the IUPAC name is Pentanal.
Correct Answer: B — Pentanal
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Q. Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-OH?
A.
2-Methylpropan-1-ol
B.
2-Methylbutan-1-ol
C.
3-Methylbutan-1-ol
D.
1-Methylbutan-2-ol
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Solution
The compound has a hydroxyl group and the longest chain has four carbons, making it 3-Methylbutan-1-ol.
Correct Answer: C — 3-Methylbutan-1-ol
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Q. Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-CH2-CHO?
A.
Hexanal
B.
Pentanal
C.
Heptanal
D.
Octanal
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Solution
The compound has a total of 6 carbons and an aldehyde functional group, making it Hexanal.
Correct Answer: A — Hexanal
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Q. Which of the following is the correct order of acidity for the following compounds: phenol, ethanol, and water?
A.
Phenol > Water > Ethanol
B.
Water > Phenol > Ethanol
C.
Ethanol > Water > Phenol
D.
Water > Ethanol > Phenol
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Solution
Phenol is more acidic than water, which is more acidic than ethanol due to the stability of the phenoxide ion.
Correct Answer: A — Phenol > Water > Ethanol
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Q. Which of the following is the correct order of basicity for the given amines?
A.
RNH2 > R2NH > R3N
B.
R3N > R2NH > RNH2
C.
R2NH > R3N > RNH2
D.
RNH2 > R3N > R2NH
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Solution
The basicity of amines decreases with increasing alkyl substitution due to steric hindrance and electron-donating effects.
Correct Answer: A — RNH2 > R2NH > R3N
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Q. Which of the following is the correct reaction for the hydrogenation of 1-butyne?
A.
C4H6 + H2 → C4H10
B.
C4H6 + H2 → C4H8
C.
C4H6 + H2 → C4H12
D.
C4H6 + H2 → C4H4
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Solution
1-butyne (C4H6) reacts with hydrogen (H2) to form butene (C4H8) under catalytic conditions.
Correct Answer: B — C4H6 + H2 → C4H8
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Q. Which of the following is the correct structure for 2,3-dimethyl-2-butanol?
A.
CH3C(CH3)(OH)C(CH3)CH3
B.
CH3C(CH3)C(OH)CH2CH3
C.
CH3C(OH)(CH3)C(CH3)CH3
D.
CH3C(CH3)C(CH3)CH2OH
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Solution
The correct structure has the hydroxyl group on the second carbon with two methyl groups on the same carbon.
Correct Answer: A — CH3C(CH3)(OH)C(CH3)CH3
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Q. Which of the following is the correct structure for 2-butyne?
A.
CH3-C≡C-CH3
B.
CH3-CH≡C-CH3
C.
CH3-C=C-CH3
D.
C≡C-CH2-CH3
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Solution
2-butyne has the structure CH3-CH≡C-CH3, with the triple bond between the second and third carbon.
Correct Answer: B — CH3-CH≡C-CH3
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Q. Which of the following is the correct structure for 2-methylpropane?
A.
CH3-CH(CH3)-CH2-CH3
B.
CH3-CH2-CH(CH3)-CH3
C.
CH3-CH(CH3)-CH(CH3)-CH3
D.
CH3-CH2-CH2-CH(CH3)
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Solution
2-methylpropane has a branched structure with a methyl group on the second carbon.
Correct Answer: B — CH3-CH2-CH(CH3)-CH3
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Q. Which of the following is the functional group of aldehydes?
A.
-CHO
B.
-CO-
C.
-C=O
D.
-OH
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Solution
Aldehydes contain the functional group -CHO, which is characterized by a carbonyl group (C=O) bonded to a hydrogen atom.
Correct Answer: A — -CHO
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Q. Which of the following is the functional group of carboxylic acids?
A.
-OH
B.
-COOH
C.
-CHO
D.
-C=O
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Solution
Carboxylic acids contain the -COOH functional group.
Correct Answer: B — -COOH
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Q. Which of the following is the functional group present in alcohols?
A.
-OH
B.
-COOH
C.
-NH2
D.
-CHO
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Solution
Alcohols contain the hydroxyl group (-OH) as their functional group.
Correct Answer: A — -OH
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Q. Which of the following is the general formula for alkenes?
A.
C_nH_(2n)
B.
C_nH_(2n+2)
C.
C_nH_(2n-2)
D.
C_nH_n
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Solution
The general formula for alkenes is C_nH_(2n), where n is the number of carbon atoms.
Correct Answer: A — C_nH_(2n)
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Q. Which of the following is the general formula for alkynes?
A.
C_nH_(2n+2)
B.
C_nH_(2n)
C.
C_nH_(2n-2)
D.
C_nH_(2n-1)
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Solution
The general formula for alkynes is C_nH_(2n-2), where n is the number of carbon atoms.
Correct Answer: C — C_nH_(2n-2)
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Q. Which of the following is the molecular formula for butane?
A.
C3H8
B.
C4H10
C.
C5H12
D.
C6H14
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Solution
Butane has the molecular formula C4H10.
Correct Answer: B — C4H10
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Q. Which of the following is the simplest alkane?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Methane (CH4) is the simplest alkane, consisting of one carbon atom.
Correct Answer: A — Methane
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Q. Which of the following is the simplest alkyne?
A.
Ethylene
B.
Acetylene
C.
Propylene
D.
Butyne
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Solution
Acetylene (C2H2) is the simplest alkyne.
Correct Answer: B — Acetylene
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Q. Which of the following is the simplest ketone?
A.
Ethanal
B.
Propanal
C.
Butan-2-one
D.
Acetone
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Solution
Acetone (propan-2-one) is the simplest ketone, with the formula (CH3)2CO.
Correct Answer: D — Acetone
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Q. Which of the following is the strongest acid?
A.
Formic acid
B.
Acetic acid
C.
Propanoic acid
D.
Butanoic acid
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Solution
Formic acid (HCOOH) is stronger than acetic acid (CH3COOH) due to the presence of a hydrogen atom directly attached to the carbonyl carbon, which stabilizes the conjugate base.
Correct Answer: A — Formic acid
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Q. Which of the following pairs are enantiomers?
A.
D-Glucose and L-Glucose
B.
C2H6 and C2H5OH
C.
n-Butane and Isobutane
D.
C3H8 and C3H6
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Solution
D-Glucose and L-Glucose are mirror images of each other, making them enantiomers.
Correct Answer: A — D-Glucose and L-Glucose
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Q. Which of the following pairs are structural isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-pentanol and 2-pentanol
C.
Ethylene and acetylene
D.
Glucose and galactose
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Solution
1-pentanol and 2-pentanol differ in the position of the hydroxyl group, making them structural isomers.
Correct Answer: B — 1-pentanol and 2-pentanol
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Q. Which of the following pairs of compounds are enantiomers?
A.
D-Glucose and L-Glucose
B.
Cis-2-butene and Trans-2-butene
C.
1-butanol and 2-butanol
D.
Acetic acid and Propanoic acid
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Solution
D-Glucose and L-Glucose are mirror images of each other, making them enantiomers.
Correct Answer: A — D-Glucose and L-Glucose
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Q. Which of the following pairs of compounds are functional isomers?
A.
C2H6 and C2H5OH
B.
C3H8 and C3H6
C.
C4H10 and C4H8
D.
C5H12 and C5H10
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Solution
C2H6 (ethane) and C2H5OH (ethanol) have different functional groups, making them functional isomers.
Correct Answer: A — C2H6 and C2H5OH
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Q. Which of the following pairs of compounds are geometric isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-butanol and 2-butanol
C.
Ethylene and acetylene
D.
Cyclohexane and hexane
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Solution
Cis-2-butene and trans-2-butene differ in the arrangement of groups around the double bond, making them geometric isomers.
Correct Answer: A — Cis-2-butene and trans-2-butene
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Q. Which of the following pairs of compounds are structural isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-pentanol and 2-pentanol
C.
Ethyl alcohol and dimethyl ether
D.
Glucose and galactose
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Solution
Ethyl alcohol (ethanol) and dimethyl ether have the same molecular formula but different structures.
Correct Answer: C — Ethyl alcohol and dimethyl ether
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Q. Which of the following polymers is known for its high tensile strength?
A.
Polyethylene
B.
Nylon
C.
Polystyrene
D.
Polyvinyl acetate
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Solution
Nylon is known for its high tensile strength and is commonly used in textiles and ropes.
Correct Answer: B — Nylon
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Q. Which of the following polymers is produced by condensation polymerization?
A.
Polyethylene
B.
Nylon-6,6
C.
Polystyrene
D.
Polyvinyl chloride
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Solution
Nylon-6,6 is produced by condensation polymerization, involving the reaction of diamines and dicarboxylic acids.
Correct Answer: B — Nylon-6,6
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