Organic Chemistry: Basic Principles Practice Questions
JEE · Chemistry · 1252 free MCQs with instant results and detailed explanations.
1252
Total
259
Easy
564
Medium
429
Hard
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Topics in Organic Chemistry: Basic Principles
Methods of Purification
225
Electronic Effects
183
IUPAC Nomenclature
202
Reaction Intermediates
218
Hyperconjugation
220
Isomerism
204
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 for 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 carbons, so it is butanoic acid.
Q2
Easy
Which compound is correctly named 2-Methylpentane?
A.
CH3-CH(CH3)-CH2-CH2-CH3
B.
CH3-CH2-CH(CH3)-CH2-CH3
C.
CH3-CH2-CH2-CH(CH3)-CH3
D.
CH3-CH2-CH2-CH3-CH(CH3)
Show Answer & Explanation
Correct Answer: B
The name '2-Methylpentane' indicates a methyl group on the second carbon of a pentane chain.
Q3
Easy
Identify the IUPAC name of the compound CH3-CH(CH3)-CH2-CHO.
A.
3-Methylbutanal
B.
2-Methylbutanal
C.
2-Butenal
D.
3-Butenal
Show Answer & Explanation
Correct Answer: A
This structure has a four-carbon chain with an aldehyde functional group, with a methyl group on the third carbon.
Q4
Medium
Which of the following is the correct IUPAC name for the compound CH3-CH2-CH(CH3)-COOH?
A.
2-Methylbutanoic acid
B.
3-Methylbutanoic acid
C.
2-Butyric acid
D.
3-Butanoic acid
Show Answer & Explanation
Correct Answer: A
The longest carbon chain has 4 carbons and a carboxylic acid group at one end, making it a butanoic acid. The methyl group on the second carbon gives the name 2-Methylbutanoic acid.
Q5
Medium
What is the IUPAC name of the compound with the structure: CH3-CH(CH3)-C(CH3)2-CH2-COOH?
A.
3-Methyl-2-pentanoic acid
B.
4-Methyl-3-pentanoic acid
C.
2,3-Dimethylbutanoic acid
D.
2-Methyl-4-pentenoic acid
Show Answer & Explanation
Correct Answer: C
There are 5 carbons in total, and the compound has two methyl groups on the second and third carbon, leading to the name 2,3-Dimethylbutanoic acid.
Q6
Medium
Identify the IUPAC name for the compound CH3-CH(CH3)-C(CH3)(Cl)-C(CH3)2-COOH.
A.
4-Chloro-3-methyl-2-pentanoic acid
B.
3-Chloro-4-methyl-3-pentanoic acid
C.
2-Chloro-4-methylbutanoic acid
D.
5-Chloro-3-methyl-2-pentanoic acid
Show Answer & Explanation
Correct Answer: A
The compound has five carbons and a carboxylic acid group, with a chloro substituent at the fourth carbon and a methyl group at the third, which gives a complete name of 4-Chloro-3-methyl-2-pentanoic acid.
Q7
Medium
What is the correct IUPAC name for the compound with the formula C6H12O?
A.
Hexanol
B.
Cyclohexanol
C.
2-Hexanol
D.
3-Hexanol
Show Answer & Explanation
Correct Answer: B
The molecular formula corresponds to a cyclic alcohol. The structure is a ring of 6 carbons with an OH group, leading to the name Cyclohexanol.
Q8
Hard
Which of the following is the correct IUPAC name for the compound CH3-CH(CH3)-C(CH2CH3)=CH-CH3?
A.
4-methyl-2-pentene
B.
3-ethyl-2-pentene
C.
3-methyl-2-pentene
D.
3-ethyl-3-methyl-2-pentene
Show Answer & Explanation
Correct Answer: C
The longest carbon chain contains 5 carbons with a double bond at the second position. The substituent is a methyl group at the 3rd carbon.
Q9
Hard
What is the IUPAC name for the compound with the structure: CH3-CH2-Cā”C-CH2-CH3?
A.
1-heptyne
B.
2-heptyne
C.
3-heptyne
D.
1-pentyne
Show Answer & Explanation
Correct Answer: A
The compound has a triple bond starting at the first carbon of a seven-carbon chain, making it 1-heptyne.
Q10
Hard
Identify the correct IUPAC name for the compound with the following structure: (CH3)2C(OH)CH2COOH.
A.
2-hydroxy-2-methylbutanoic acid
B.
2-hydroxy-3-methylbutanoic acid
C.
3-hydroxy-2-methylbutanoic acid
D.
3-hydroxy-3-methylbutanoic acid
Show Answer & Explanation
Correct Answer: A
The compound contains a hydroxyl and a carboxylic acid functional group, with the longest chain containing 4 carbons.
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Organic Chemistry: Basic Principles ā JEE Chemistry Practice Questions Online
This page contains 1252 practice MCQs for the chapter Organic Chemistry: Basic Principles in JEE Chemistry. The questions are organized by difficulty ā 259 easy, 564 medium, 429 hard ā 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 6 topics, giving you comprehensive coverage of the entire chapter.