Q. Which of the following is the correct IUPAC name for C3H7-COOH?
A.
Propanoic acid
B.
Butanoic acid
C.
Pentanoic acid
D.
Hexanoic acid
Show solution
Solution
The compound has 3 carbons in the longest chain and a carboxylic acid group, hence it is Propanoic acid.
Correct Answer:
A
— Propanoic acid
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Q. Which of the following is the correct IUPAC name for C5H10?
A.
Pentane
B.
Cyclopentane
C.
1-Pentene
D.
2-Pentene
Show solution
Solution
C5H10 corresponds to pentane, which is a straight-chain alkane with 5 carbon atoms.
Correct Answer:
A
— Pentane
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Q. Which of the following is the correct IUPAC name for C6H12?
A.
Hexane
B.
Cyclohexane
C.
2-Hexene
D.
1-Hexyne
Show solution
Solution
C6H12 is a straight-chain alkane with 6 carbons, which is named Hexane.
Correct Answer:
A
— Hexane
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Q. Which of the following is the correct IUPAC name for C6H5-CH2-CH2-COOH?
A.
Phenylbutanoic acid
B.
Butylbenzoic acid
C.
Benzoic acid
D.
Phenylpropanoic acid
Show solution
Solution
The compound has a phenyl group attached to a butanoic acid structure, making it Phenylbutanoic acid.
Correct Answer:
A
— Phenylbutanoic acid
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Q. Which of the following is the correct IUPAC name for C6H5-CH2-CH3?
A.
Ethylbenzene
B.
Phenylpropane
C.
Benzyl ethane
D.
Benzene ethyl
Show solution
Solution
The compound has a phenyl group attached to an ethyl group, making it Ethylbenzene.
Correct Answer:
A
— Ethylbenzene
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Q. Which of the following is the correct IUPAC name for CH3-CH2-CH(CH3)-OH?
A.
2-Methylpropan-1-ol
B.
3-Methylbutan-1-ol
C.
2-Methylbutan-1-ol
D.
3-Methylpropan-1-ol
Show solution
Solution
The longest chain has four carbons, and the hydroxyl group is on the first carbon, with a methyl group on the second carbon, making it 2-Methylbutan-1-ol.
Correct Answer:
C
— 2-Methylbutan-1-ol
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Q. Which of the following is the correct IUPAC name for the compound C2H5-CHO?
A.
Ethanal
B.
Propanoic acid
C.
Acetaldehyde
D.
Ethyl aldehyde
Show solution
Solution
The compound is an aldehyde with two carbons, hence the IUPAC name is Ethanal.
Correct Answer:
A
— Ethanal
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Q. Which of the following is the correct IUPAC name for the compound C3H6O?
A.
Propylene oxide
B.
Acetone
C.
Propanal
D.
Cyclopropanol
Show solution
Solution
C3H6O can be identified as Propanal, which is an aldehyde with three carbons.
Correct Answer:
C
— Propanal
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH(CH3)-C(CH3)2-COOH?
A.
2-Hydroxy-3-methylpentanoic acid
B.
3-Methyl-2-pentanoic acid
C.
2-Methyl-3-pentanoic acid
D.
3-Hydroxy-2-methylpentanoic acid
Show solution
Solution
The longest chain has 5 carbons, with a methyl group on the second carbon and a carboxylic acid on the first, making it 3-Methyl-2-pentanoic acid.
Correct Answer:
B
— 3-Methyl-2-pentanoic acid
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH2-CH(CH3)-C≡C-H?
A.
3-Methyl-1-pentyne
B.
2-Methyl-1-pentyne
C.
1-Methyl-2-pentyne
D.
1-Methyl-3-pentyne
Show solution
Solution
The compound has a triple bond and the longest chain has five carbons, making it 3-Methyl-1-pentyne.
Correct Answer:
A
— 3-Methyl-1-pentyne
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH2-CH(CH3)-OH?
A.
2-Propanol
B.
1-Butanol
C.
2-Butanol
D.
3-Butanol
Show solution
Solution
The compound has a hydroxyl group on the second carbon of a four-carbon chain, making it 2-Butanol.
Correct Answer:
C
— 2-Butanol
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH2-CH2-CH2-COOH?
A.
Pentanoic acid
B.
Butanoic acid
C.
Hexanoic acid
D.
Heptanoic acid
Show solution
Solution
The compound is a carboxylic acid with 5 carbons, named Pentanoic acid.
Correct Answer:
A
— Pentanoic acid
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH2-CH2-CHO?
A.
Butanal
B.
Propionaldehyde
C.
Pentanal
D.
Ethanal
Show solution
Solution
The compound has a four-carbon chain with an aldehyde functional group, so it is named Butanal.
Correct Answer:
A
— Butanal
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Q. Which of the following is the correct IUPAC name for the compound with the formula C3H7-COOH?
A.
Propanoic acid
B.
Butanoic acid
C.
Acetic acid
D.
Isobutyric acid
Show solution
Solution
The compound has three carbons in the longest chain and a carboxylic acid functional group, making it Propanoic acid.
Correct Answer:
A
— Propanoic acid
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Q. Which of the following is the correct IUPAC name for the compound with the formula C5H10?
A.
Pentene
B.
Cyclopentane
C.
Pentane
D.
2-Pentene
Show solution
Solution
The compound is a straight-chain alkane with five carbons, hence the name is Pentane.
Correct Answer:
C
— Pentane
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Q. Which of the following is the correct IUPAC name for the compound with the formula C6H5-CH2-CH2-COOH?
A.
Phenylbutanoic acid
B.
Butylphenyl acid
C.
Benzoic acid
D.
Phenylpropanoic acid
Show solution
Solution
The compound has a phenyl group attached to a butanoic acid, making it Phenylbutanoic acid.
Correct Answer:
A
— Phenylbutanoic acid
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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
Show solution
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 C4H10?
A.
Butane
B.
Isobutane
C.
Butene
D.
Cyclobutane
Show solution
Solution
C4H10 is butane, which is a straight-chain alkane with 4 carbon atoms.
Correct Answer:
A
— Butane
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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
Show solution
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
Show solution
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
Show solution
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
Show solution
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
Show solution
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 functional group present in alcohols?
A.
-OH
B.
-COOH
C.
-NH2
D.
-CHO
Show solution
Solution
Alcohols contain the hydroxyl group (-OH) as their functional group.
Correct Answer:
A
— -OH
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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
Show solution
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
Show solution
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
Show solution
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
Show solution
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
Show solution
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
Show solution
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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Showing 181 to 210 of 233 (8 Pages)
Organic Chemistry Basics MCQ & Objective Questions
Understanding the fundamentals of Organic Chemistry is crucial for students preparing for school exams and competitive tests in India. Mastering Organic Chemistry Basics not only helps in grasping complex concepts but also enhances your ability to tackle MCQs and objective questions effectively. Regular practice with these questions can significantly improve your exam scores and boost your confidence.
What You Will Practise Here
Fundamental concepts of organic compounds and their classification
Key functional groups and their properties
Basic reaction mechanisms and types of organic reactions
Important nomenclature rules for organic compounds
Understanding isomerism and its types
Common organic chemistry reactions and their applications
Diagrams and structures of significant organic molecules
Exam Relevance
Organic Chemistry Basics is a vital topic in various examinations, including CBSE, State Boards, NEET, and JEE. Questions from this area often focus on identifying functional groups, predicting reaction outcomes, and applying nomenclature rules. Familiarity with common question patterns, such as multiple-choice questions and assertion-reason type questions, will help you excel in these exams.
Common Mistakes Students Make
Confusing structural isomers with stereoisomers
Overlooking the importance of functional groups in reactions
Misapplying nomenclature rules leading to incorrect compound names
Neglecting to balance chemical equations in reaction questions
Failing to recognize the significance of reaction mechanisms
FAQs
Question: What are some important Organic Chemistry Basics MCQ questions I should focus on?Answer: Focus on questions related to functional groups, reaction mechanisms, and nomenclature, as these are frequently tested in exams.
Question: How can I improve my understanding of Organic Chemistry Basics?Answer: Regular practice with objective questions and reviewing key concepts will enhance your understanding and retention.
Start solving practice MCQs today to test your understanding of Organic Chemistry Basics. This will not only prepare you for exams but also solidify your grasp of essential concepts. Your success in exams is just a question away!
