JEE Main MCQ & Objective Questions
The JEE Main exam is a crucial step for students aspiring to enter prestigious engineering colleges in India. It tests not only knowledge but also the ability to apply concepts effectively. Practicing MCQs and objective questions is essential for scoring better, as it helps in familiarizing students with the exam pattern and enhances their problem-solving skills. Engaging with practice questions allows students to identify important questions and strengthen their exam preparation.
What You Will Practise Here
Fundamental concepts of Physics, Chemistry, and Mathematics
Key formulas and their applications in problem-solving
Important definitions and theories relevant to JEE Main
Diagrams and graphical representations for better understanding
Numerical problems and their step-by-step solutions
Previous years' JEE Main questions for real exam experience
Time management strategies while solving MCQs
Exam Relevance
The topics covered in JEE Main are not only significant for the JEE exam but also appear in various CBSE and State Board examinations. Many concepts are shared with the NEET syllabus, making them relevant across multiple competitive exams. Common question patterns include conceptual applications, numerical problems, and theoretical questions that assess a student's understanding of core subjects.
Common Mistakes Students Make
Misinterpreting the question stem, leading to incorrect answers
Neglecting units in numerical problems, which can change the outcome
Overlooking negative marking and not managing time effectively
Relying too heavily on rote memorization instead of understanding concepts
Failing to review and analyze mistakes from practice tests
FAQs
Question: How can I improve my speed in solving JEE Main MCQ questions?Answer: Regular practice with timed quizzes and focusing on shortcuts can significantly enhance your speed.
Question: Are the JEE Main objective questions similar to previous years' papers?Answer: Yes, many questions are based on previous years' patterns, so practicing them can be beneficial.
Question: What is the best way to approach JEE Main practice questions?Answer: Start with understanding the concepts, then attempt practice questions, and finally review your answers to learn from mistakes.
Now is the time to take charge of your preparation! Dive into solving JEE Main MCQs and practice questions to test your understanding and boost your confidence for the exam.
Q. What is the isoelectric point of a protein?
A.
The pH at which the protein is positively charged
B.
The pH at which the protein is negatively charged
C.
The pH at which the protein has no net charge
D.
The pH at which the protein denatures
Show solution
Solution
The isoelectric point of a protein is the pH at which the protein has no net charge, leading to minimal solubility.
Correct Answer:
C
— The pH at which the protein has no net charge
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Q. What is the IUPAC name for CH3-CH2-CH=CH2?
A.
Butene
B.
Propene
C.
Butyne
D.
Pentene
Show solution
Solution
The IUPAC name for CH3-CH2-CH=CH2 is butene.
Correct Answer:
A
— Butene
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Q. What is the IUPAC name for CH3-CH2-CHO?
A.
Ethyl alcohol
B.
Propionaldehyde
C.
Acetaldehyde
D.
Butyraldehyde
Show solution
Solution
The IUPAC name for CH3-CH2-CHO is acetaldehyde.
Correct Answer:
C
— Acetaldehyde
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Q. What is the IUPAC name for the compound C2H5-CHO?
A.
Ethanal
B.
Propanoic acid
C.
Acetaldehyde
D.
Butanal
Show solution
Solution
The compound is an aldehyde with two carbons, hence the name is Ethanal.
Correct Answer:
A
— Ethanal
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Q. What is the IUPAC name for the compound C2H5-CO-CH3?
A.
2-Pentanone
B.
3-Pentanone
C.
Butan-2-one
D.
Butan-3-one
Show solution
Solution
The compound is a ketone with four carbons, and the carbonyl group is on the second carbon, hence Butan-2-one.
Correct Answer:
C
— Butan-2-one
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Q. What is the IUPAC name for the compound C2H5OH?
A.
Ethanol
B.
Ethylene
C.
Ethane
D.
Acetaldehyde
Show solution
Solution
C2H5OH is ethanol, which is an alcohol with two carbon atoms.
Correct Answer:
A
— Ethanol
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Q. What is the IUPAC name for the compound C3H6O?
A.
Propylene oxide
B.
Acetone
C.
Propanal
D.
Cyclopropanol
Show solution
Solution
C3H6O is an aldehyde with three carbons, named Propanal.
Correct Answer:
C
— Propanal
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Q. What is the IUPAC name for the compound C3H7-CO-CH3?
A.
2-Pentanone
B.
3-Pentanone
C.
Butan-2-one
D.
Butan-3-one
Show solution
Solution
The compound is a ketone with a four-carbon chain, and the carbonyl group is on the second carbon, hence it is Butan-2-one.
Correct Answer:
C
— Butan-2-one
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Q. What is the IUPAC name for the compound C6H12O?
A.
Hexanal
B.
Hexan-1-ol
C.
Cyclohexanol
D.
2-Hexanol
Show solution
Solution
The compound is a cyclic alcohol with six carbons, hence it is named Cyclohexanol.
Correct Answer:
C
— Cyclohexanol
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Q. What is the IUPAC name for the compound C6H5-CH(CH3)-OH?
A.
Benzyl alcohol
B.
Phenylpropan-2-ol
C.
2-Phenylpropan-1-ol
D.
2-Phenylpropan-2-ol
Show solution
Solution
The compound has a phenyl group and a hydroxyl group on the second carbon of a three-carbon chain, hence it is Phenylpropan-2-ol.
Correct Answer:
B
— Phenylpropan-2-ol
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Q. What is the IUPAC name for the compound CH3-CH(CH3)-CH2-CH3?
A.
2-Methylbutane
B.
3-Methylbutane
C.
Butane
D.
Pentane
Show solution
Solution
The longest chain has four carbons, and there is a methyl group on the second carbon, making it 2-Methylbutane.
Correct Answer:
A
— 2-Methylbutane
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Q. What is the IUPAC name for the compound CH3-CH(CH3)-CH2-CHO?
A.
3-Methylbutanal
B.
2-Methylbutanal
C.
4-Methylbutanal
D.
Pentanal
Show solution
Solution
The longest chain has four carbons with an aldehyde group, and the methyl group is on the second carbon, making it 2-Methylbutanal.
Correct Answer:
B
— 2-Methylbutanal
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Q. What is the 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 longest carbon chain contains five carbons, and the functional group is a carboxylic acid, hence the name is Pentanoic acid.
Correct Answer:
A
— Pentanoic acid
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Q. What is the IUPAC name for the compound with the formula C2H5-CHO?
A.
Ethanal
B.
Propanoic acid
C.
Acetaldehyde
D.
Butanal
Show solution
Solution
The compound is an aldehyde with two carbons, which is named Acetaldehyde or Ethanal.
Correct Answer:
C
— Acetaldehyde
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Q. What is the IUPAC name for the compound with the formula C2H5-CO-CH3?
A.
2-Pentanone
B.
3-Pentanone
C.
Butan-2-one
D.
Butan-3-one
Show solution
Solution
The compound has a ketone functional group with 4 carbons, making it Butan-2-one.
Correct Answer:
C
— Butan-2-one
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Q. What is the IUPAC name for the compound with the formula C2H5OH?
A.
Ethanol
B.
Ethylene glycol
C.
Ethyl alcohol
D.
Dimethyl ether
Show solution
Solution
C2H5OH is an alcohol with 2 carbons, named Ethanol.
Correct Answer:
A
— Ethanol
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Q. What is the IUPAC name for the compound with the formula C3H6?
A.
Propene
B.
Cyclopropane
C.
Propyne
D.
Propane
Show solution
Solution
C3H6 is an alkene with three carbons, which is named Propene.
Correct Answer:
A
— Propene
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Q. What is the IUPAC name for the compound with the formula C3H7-CO-CH3?
A.
Butan-2-one
B.
Propan-2-one
C.
Pentanal
D.
Butanal
Show solution
Solution
The compound is a ketone with 4 carbons, and the carbonyl group is on the second carbon, making it Butan-2-one.
Correct Answer:
A
— Butan-2-one
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Q. What is the 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 is isobutyric acid, which is a branched-chain carboxylic acid with three carbons.
Correct Answer:
D
— Isobutyric acid
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Q. What is the IUPAC name for the compound with the formula C3H7OH?
A.
Propan-1-ol
B.
Propan-2-ol
C.
Butan-1-ol
D.
Methanol
Show solution
Solution
The compound is an alcohol with three carbons and the hydroxyl group on the second carbon, hence the name is Propan-2-ol.
Correct Answer:
B
— Propan-2-ol
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Q. What is the IUPAC name for the compound with the formula C3H8?
A.
Propene
B.
Propane
C.
Propyne
D.
Cyclopropane
Show solution
Solution
C3H8 is propane, which is an alkane.
Correct Answer:
B
— Propane
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Q. What is the IUPAC name for the compound with the formula C4H10O?
A.
Butanol
B.
Butanal
C.
Ethyl methyl ether
D.
Tert-butanol
Show solution
Solution
C4H10O can be identified as an alcohol with 4 carbons, which is named Butanol.
Correct Answer:
A
— Butanol
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Q. What is the IUPAC name for the compound with the formula C4H8O?
A.
Butanal
B.
Butan-2-ol
C.
Butan-1-ol
D.
Cyclobutanol
Show solution
Solution
C4H8O can correspond to butan-2-ol, which is a secondary alcohol.
Correct Answer:
B
— Butan-2-ol
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Q. What is the IUPAC name for the compound with the formula C4H9-CHO?
A.
Butanal
B.
Pentanal
C.
Propionaldehyde
D.
Isobutyraldehyde
Show solution
Solution
The compound has four carbons and an aldehyde functional group, making it Butanal.
Correct Answer:
A
— Butanal
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Q. What is the IUPAC name for the compound with the formula C4H9-CO-CH3?
A.
Butan-2-one
B.
Pentanal
C.
Butan-1-one
D.
Propan-2-one
Show solution
Solution
The compound is a ketone with a four-carbon chain, thus it is Butan-2-one.
Correct Answer:
A
— Butan-2-one
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Q. What is the IUPAC name for the compound with the formula C4H9-COOH?
A.
Butanoic acid
B.
Pentanoic acid
C.
Hexanoic acid
D.
Heptanoic acid
Show solution
Solution
The compound has four carbons in the longest chain and a carboxylic acid functional group, hence it is Butanoic acid.
Correct Answer:
A
— Butanoic acid
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Q. What is the IUPAC name for the compound with the formula C4H9Cl?
A.
1-Chlorobutane
B.
2-Chlorobutane
C.
Chloropropane
D.
Butyl chloride
Show solution
Solution
The compound is a chlorinated alkane with four carbons, and the chlorine is on the first carbon, making it 1-Chlorobutane.
Correct Answer:
A
— 1-Chlorobutane
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Q. What is the IUPAC name for the compound with the formula C5H10O?
A.
Pentanal
B.
2-Pentanone
C.
3-Pentanone
D.
Butanol
Show solution
Solution
The compound is a ketone with a five-carbon chain, and the carbonyl group is on the second carbon, making it 2-Pentanone.
Correct Answer:
B
— 2-Pentanone
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Q. What is the IUPAC name for the compound with the formula C5H11-COOH?
A.
Pentanoic acid
B.
Hexanoic acid
C.
Butanoic acid
D.
Heptanoic acid
Show solution
Solution
The longest carbon chain contains five carbons, and the functional group is a carboxylic acid, hence the name is Pentanoic acid.
Correct Answer:
A
— Pentanoic acid
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Q. What is the IUPAC name for the compound with the formula C5H11-NH2?
A.
Pentylamine
B.
Butylamine
C.
Hexylamine
D.
Amylamine
Show solution
Solution
The compound is a primary amine with five carbons, hence it is named Pentylamine.
Correct Answer:
A
— Pentylamine
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