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Organic Chemistry: Basic Principles Practice Questions

Class 11 · Chemistry · 1812 free MCQs with instant results and detailed explanations.

1812
Total
569
Easy
911
Medium
332
Hard

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Topics in Organic Chemistry: Basic Principles

Isomerism 481
Methods of Purification 511
Electronic Effects 474
Nomenclature 346

Sample Questions from Organic Chemistry: Basic Principles

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
What is the IUPAC name of the compound CH3-CH2-CH(CH3)-CH2-CH3?
A. 2-Pentane
B. 3-Pentene
C. 2-Methylbutane
D. 3-Methylbutane
Show Answer & Explanation
Correct Answer: C
The longest carbon chain has five carbons with a methyl group on the second carbon, hence the name 2-Methylbutane.
Q2
Easy
Which of the following is the correct name for the compound with the formula C2H5OH?
A. Ethanol
B. Ethanoic acid
C. Ethyne
D. Ethene
Show Answer & Explanation
Correct Answer: A
C2H5OH is an alcohol with the functional group -OH, which is identified as ethanol.
Q3
Easy
What is the IUPAC name of CH3-CH2-CH2-COOH?
A. Butanoic acid
B. Propanoic acid
C. Pentanoic acid
D. Hexanoic acid
Show Answer & Explanation
Correct Answer: A
The longest carbon chain contains four carbon atoms, making it butanoic acid.
Q4
Medium
Which of the following names represents a compound with a double bond?
A. Hexane
B. Hexene
C. Hexyne
D. Hexan-1-ol
Show Answer & Explanation
Correct Answer: B
Hexene contains a double bond in its structure, while hexane is an alkane with single bonds.
Q5
Medium
Which of the following is the correct IUPAC name for the compound with the formula C4H9Br?
A. Bromobutane
B. Butyl bromide
C. 1-Bromobutane
D. 2-Bromobutane
Show Answer & Explanation
Correct Answer: C
For C4H9Br, the correct IUPAC name indicates the position of the bromine substituent, which is at the first carbon.
Q6
Medium
What is the correct IUPAC name for (CH3)2C(CH2OH)2?
A. 2-Methyl-2,3-butanediol
B. 2,2-Dihydroxy-3-methylbutane
C. 2,3-Dimethylbutane
D. 2-Hydroxy-2-methylbutane
Show Answer & Explanation
Correct Answer: B
The compound has two hydroxyl groups located on the second carbon, making it dihydroxy.
Q7
Medium
What is the IUPAC name for the following compound: CH3-CH2-CO-CH3?
A. Butan-1-one
B. 2-Butanone
C. Propanal
D. Butanal
Show Answer & Explanation
Correct Answer: B
The compound is a ketone with four carbons, and the carbonyl group is on the second carbon.
Q8
Hard
Which of the following compounds has the IUPAC name 2-methylbutane?
A. C5H12
B. C4H10
C. C5H10
D. C6H14
Show Answer & Explanation
Correct Answer: A
2-methylbutane has a five-carbon chain with a methyl group on the second carbon.
Q9
Hard
What is the IUPAC name of the compound with the formula C4H8 that has a double bond between the first and second carbon atoms?
A. 1-butene
B. 2-butene
C. butyne
D. cyclobutane
Show Answer & Explanation
Correct Answer: A
1-butene has a double bond at the first carbon position of a four-carbon chain.
Q10
Hard
Which of the following represents the systematic name for the cyclic compound with the formula C6H12?
A. 1-hexene
B. cyclohexane
C. hexane
D. 2-methylpentane
Show Answer & Explanation
Correct Answer: B
Cyclohexane has no double bonds and is a six-membered carbon ring.

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Organic Chemistry: Basic Principles — Class 11 Chemistry Practice Questions Online

This page contains 1812 practice MCQs for the chapter Organic Chemistry: Basic Principles in Class 11 Chemistry. The questions are organized by difficulty — 569 easy, 911 medium, 332 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.