Organic Chemistry Practice Questions
JEE · Chemistry · 1437 free MCQs with instant results and detailed explanations.
1437
Total
304
Easy
631
Medium
502
Hard
Start Practicing Organic Chemistry
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Topics in Organic Chemistry
Reaction Mechanisms
360
IUPAC Nomenclature
353
Named Reactions
367
Isomerism
357
Sample Questions from Organic Chemistry
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the IUPAC name of CH3-CH2-CH(CH3)-CH2-CH3?
A.
2-Pentene
B.
3-Pentanol
C.
3-Methylbutane
D.
2-Hexanol
Show Answer & Explanation
Correct Answer: C
The longest continuous carbon chain has 5 carbons with a methyl group at the third carbon.
Q2
Easy
Which of the following is the correct IUPAC name for CH3-CH2-CO-CH2-CH3?
A.
4-Pentanone
B.
3-Pentanone
C.
2-Butanone
D.
1-Pentanone
Show Answer & Explanation
Correct Answer: B
The compound is a ketone with the longest chain being pentane, with the carbonyl group at the 3rd position.
Q3
Easy
What is the IUPAC name for the compound with the formula C5H12?
A.
2-Pentene
B.
Pentane
C.
Cyclopentane
D.
3-Methylbutane
Show Answer & Explanation
Correct Answer: B
C5H12 is an alkane with a straight-chain structure, which is named pentane.
Q4
Medium
What is the IUPAC name of the compound with the following structure: CH3-CH2-CH(CH3)-C(CH3)2-COOH?
A.
3-methyl-4-ethylpentanoic acid
B.
2,3-dimethylpentanoic acid
C.
3-methyl-2,2-butanedioic acid
D.
2-ethyl-3-methylbutanoic acid
Show Answer & Explanation
Correct Answer: A
The longest carbon chain containing the carboxylic acid group is identified first, which has 5 carbons. The substituents are located and named accordingly, leading to the IUPAC name.
Q5
Medium
Which of the following compounds is correctly named according to IUPAC nomenclature: C6H5-CH2-CH(CH3)-OH?
A.
2-(phenyl)propan-1-ol
B.
2-phenylpropan-2-ol
C.
1-(phenyl)propan-2-ol
D.
1-phenylpropan-2-ol
Show Answer & Explanation
Correct Answer: A
The compound has a propanol backbone with a phenyl substituent at the second carbon. The hydroxyl group is prioritized as a functional group, hence the naming follows the correct sequence.
Q6
Medium
What is the correct IUPAC name for the compound having the molecular formula C4H8, with the structure CH2=CH-CH2-CH3?
A.
Butene
B.
1-Butene
C.
2-Butene
D.
Cyclobutane
Show Answer & Explanation
Correct Answer: B
The molecule is a straight-chain alkene with four carbons. The double bond is located between the first and second carbons, which is why it is named 1-butene according to IUPAC rules.
Q7
Medium
What is the IUPAC name of C4H10?
A.
Butane
B.
Propane
C.
Pentane
D.
Ethane
Show Answer & Explanation
Correct Answer: A
C4H10 corresponds to butane, which has a straight-chain structure with four carbon atoms.
Q8
Hard
Which of the following is the correct IUPAC name for the compound CH3-CH(CH3)-CH2-COOH?
A.
3-methylbutanoic acid
B.
2-methylbutanoic acid
C.
4-methylbutanoic acid
D.
2-pentenoic acid
Show Answer & Explanation
Correct Answer: A
The compound has a four-carbon chain with a carboxylic acid group at the end and a methyl group on the second carbon.
Q9
Hard
What is the correct IUPAC name for the compound with the structure CH3-CH2-CHOH-CH2-CH3?
A.
1-pentanol
B.
2-pentanol
C.
3-pentanol
D.
4-pentanol
Show Answer & Explanation
Correct Answer: B
The hydroxyl (OH) group is on the second carbon of a five-carbon chain, making it 2-pentanol.
Q10
Hard
Which of the following correctly names the compound with the formula C8H10 and a cyclohexane ring with two methyl groups at positions 1 and 2?
A.
1,2-dimethylcyclohexane
B.
1,3-dimethylcyclohexane
C.
2,3-dimethylcyclohexane
D.
1,4-dimethylcyclohexane
Show Answer & Explanation
Correct Answer: A
The methyl groups are on carbon 1 and carbon 2 of the cyclohexane ring, thus named 1,2-dimethylcyclohexane.
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Organic Chemistry — JEE Chemistry Practice Questions Online
This page contains 1437 practice MCQs for the chapter Organic Chemistry in JEE Chemistry. The questions are organized by difficulty — 304 easy, 631 medium, 502 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.