Organic Chemistry: Basic Principles Practice Questions
NEET · Chemistry · 1518 free MCQs with instant results and detailed explanations.
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Easy
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Medium
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Hard
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Topics in Organic Chemistry: Basic Principles
Isomerism
384
Reaction Intermediates
369
Electronic Effects
384
IUPAC Nomenclature
381
Sample Questions from Organic Chemistry: Basic Principles
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following is the correct IUPAC name for CH3-CH2-CH(CH3)-CH2-CH2-CH3?
A.
2-Methylhexane
B.
3-Methylhexane
C.
4-Methylhexane
D.
1-Methylhexane
Show Answer & Explanation
Correct Answer: A
The longest carbon chain has 6 carbons, and the methyl group is on the second carbon. Hence, it is named 2-Methylhexane.
Q2
Easy
What is the IUPAC name of the compound with the formula C5H10 and a double bond between the first and second carbon?
A.
Pent-1-ene
B.
Pent-2-ene
C.
Cyclopentene
D.
2-Pentene
Show Answer & Explanation
Correct Answer: A
The double bond is between the first and second carbons, so the correct name is Pent-1-ene.
Q3
Easy
Which of the following compounds is a ketone?
A.
Butan-2-one
B.
Butanal
C.
Pentanoic acid
D.
1-Pentene
Show Answer & Explanation
Correct Answer: A
Butan-2-one contains a carbonyl group (C=O) within the carbon chain, making it a ketone.
Q4
Medium
Which of the following is the correct IUPAC name for the compound with the structure CH3-CH(CH3)-CH2-CH3?
A.
2-Methylbutane
B.
3-Methylbutane
C.
2-Butylpropane
D.
Butane
Show Answer & Explanation
Correct Answer: A
The longest carbon chain has 4 carbons, so it's a butane. The methyl group is on the second carbon, making the name 2-Methylbutane.
Q5
Medium
What is the correct IUPAC name for the compound with the formula C6H5-CH2-CH(CH3)-C(CH3)2?
A.
1-Ethyl-4-methylbenzene
B.
1-Phenyl-2-methylpropane
C.
1-Benzenemethanol
D.
1-Phenyl-1,2-dimethylpropane
Show Answer & Explanation
Correct Answer: B
The compound has a phenyl group attached to a propane chain with a methyl group on the second carbon, making it 1-Phenyl-2-methylpropane.
Q6
Medium
Which of the following represents the correct IUPAC name for the compound with the structural formula CH3-CH2-Cā”C-CH3?
A.
2-Pentyne
B.
3-Pentyne
C.
1-Pentyne
D.
Butyne
Show Answer & Explanation
Correct Answer: C
The compound has a triple bond between the first and second carbon atoms, indicating it is 1-Pentyne.
Q7
Medium
Identify the correct IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-C(OH)2-CH3.
A.
2,3-Dimethyl-2-pentanol
B.
2-Methyl-3-pentanol
C.
2,3-Dimethyl-3-pentanol
D.
2-Pentanol
Show Answer & Explanation
Correct Answer: A
The compound has two methyl groups on the second and third carbons, along with a hydroxyl group at the second carbon; thus it is 2,3-Dimethyl-2-pentanol.
Q8
Hard
Which of the following compounds is correctly named as per IUPAC nomenclature?
A.
3-methyl-4-ethylhexane
B.
2,3-dimethylpentane
C.
4-ethyl-3-methylheptane
D.
2-isopropyl-3-methylpentane
Show Answer & Explanation
Correct Answer: C
The correct IUPAC name is 4-ethyl-3-methylheptane because the longest carbon chain contains 7 carbons, and the substituents are correctly numbered to give the lowest possible numbers.
Q9
Hard
What is the IUPAC name for the compound with the structure CH3-CH(CH3)-CH2-CH2-CHO?
A.
3-methylbutanal
B.
4-methylpentanal
C.
2-methylpentanal
D.
3-ethylbutanal
Show Answer & Explanation
Correct Answer: C
The structure corresponds to a 5-carbon chain (pentanal) with a methyl group on the second carbon, making it 2-methylpentanal.
Q10
Hard
Which of the following names is incorrect as per the IUPAC system for the given structure?
A.
cyclopentanol
B.
1,2-dimethylcyclobutane
C.
3-ethyl-1-isopropylcyclohexane
D.
1-ethyl-2-methylcycloheptane
Show Answer & Explanation
Correct Answer: B
1,2-dimethylcyclobutane is incorrect because the numbering does not provide the lowest locants for substituents; it should be 1,3-dimethylcyclobutane.
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This page contains 1518 practice MCQs for the chapter Organic Chemistry: Basic Principles in NEET Chemistry. The questions are organized by difficulty ā 330 easy, 676 medium, 512 hard ā so you can choose the right level for your preparation.
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