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 product of the dehydration of 2-butanol?
A.
Butene
B.
Butyne
C.
Butadiene
D.
Butanol
Show solution
Solution
Dehydration of 2-butanol leads to the formation of butene as the major product.
Correct Answer:
A
— Butene
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Q. What is the product of the dehydration of ethanol?
A.
Ethylene
B.
Acetaldehyde
C.
Diethyl ether
D.
Acetic acid
Show solution
Solution
Dehydration of ethanol leads to the formation of ethylene (ethene) by elimination of water.
Correct Answer:
A
— Ethylene
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Q. What is the product of the esterification reaction between acetic acid and ethanol?
A.
Ethyl acetate
B.
Acetic anhydride
C.
Ethanol acetate
D.
Acetic acid
Show solution
Solution
The reaction between acetic acid and ethanol produces ethyl acetate.
Correct Answer:
A
— Ethyl acetate
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Q. What is the product of the hydration of ethene in the presence of sulfuric acid?
A.
Ethanol
B.
Ethane
C.
Acetic acid
D.
Butanol
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Solution
The hydration of ethene in the presence of sulfuric acid produces ethanol.
Correct Answer:
A
— Ethanol
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Q. What is the product of the hydrolysis of 1-chloropropane in the presence of water?
A.
Propane
B.
Propan-1-ol
C.
Propan-2-ol
D.
Chloropropane
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Solution
The hydrolysis of 1-chloropropane in the presence of water yields propan-1-ol as the main product.
Correct Answer:
B
— Propan-1-ol
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Q. What is the product of the hydrolysis of ethyl acetate in the presence of a strong acid?
A.
Ethanol and Acetic Acid
B.
Ethylene and Water
C.
Acetic Anhydride
D.
Ethyl Alcohol
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Solution
Hydrolysis of ethyl acetate in acid gives ethanol and acetic acid.
Correct Answer:
A
— Ethanol and Acetic Acid
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Q. What is the product of the oxidation of a primary alcohol?
A.
Aldehyde
B.
Ketone
C.
Carboxylic acid
D.
Alkane
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Solution
The oxidation of a primary alcohol results in the formation of an aldehyde.
Correct Answer:
A
— Aldehyde
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Q. What is the product of the ozonolysis of 1-pentene?
A.
Pentanal
B.
Acetaldehyde
C.
Butan-2-one
D.
Propanoic acid
Show solution
Solution
Ozonolysis of 1-pentene yields pentanal as one of the products.
Correct Answer:
A
— Pentanal
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Q. What is the product of the reaction between 1-bromopropane and sodium ethoxide?
A.
Ethyl propyl ether
B.
Propyl ethyl ether
C.
1-bromo-2-ethylpropane
D.
No reaction
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Solution
The reaction of 1-bromopropane with sodium ethoxide leads to the formation of ethyl propyl ether through nucleophilic substitution.
Correct Answer:
A
— Ethyl propyl ether
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Q. What is the product of the reaction between 1-butyne and HBr?
A.
1-bromobutane
B.
2-bromobutane
C.
butane
D.
butyne
Show solution
Solution
The reaction of 1-butyne with HBr leads to the formation of 2-bromobutane due to Markovnikov's rule.
Correct Answer:
B
— 2-bromobutane
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Q. What is the product of the reaction between 1-chlorobutane and potassium cyanide?
A.
1-cyanobutane
B.
2-cyanobutane
C.
butane
D.
no reaction
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Solution
1-cyanobutane is formed through nucleophilic substitution where the cyanide ion acts as a nucleophile.
Correct Answer:
A
— 1-cyanobutane
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Q. What is the product of the reaction between a carboxylic acid and an alcohol?
A.
Amide
B.
Ester
C.
Aldehyde
D.
Ketone
Show solution
Solution
The reaction between a carboxylic acid and an alcohol produces an ester.
Correct Answer:
B
— Ester
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Q. What is the product of the reaction between acetic acid and sodium bicarbonate?
A.
Sodium acetate
B.
Carbon dioxide
C.
Water
D.
All of the above
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Solution
The reaction produces sodium acetate, carbon dioxide, and water, making 'All of the above' the correct answer.
Correct Answer:
D
— All of the above
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Q. What is the product of the reaction between acetone and iodine in the presence of a base?
A.
Iodoacetone
B.
Iodoform
C.
Bromoacetone
D.
Chloroacetone
Show solution
Solution
The product is Iodoform, formed from the reaction of acetone with iodine in the presence of a base.
Correct Answer:
B
— Iodoform
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Q. What is the product of the reaction between an alcohol and a carboxylic acid?
A.
Ester
B.
Ether
C.
Aldehyde
D.
Ketone
Show solution
Solution
The reaction between an alcohol and a carboxylic acid produces an ester through a process called esterification.
Correct Answer:
A
— Ester
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Q. What is the product of the reaction between an aldehyde and a Grignard reagent?
A.
Alcohol
B.
Ketone
C.
Carboxylic acid
D.
Alkane
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Solution
The reaction between an aldehyde and a Grignard reagent produces a secondary alcohol after hydrolysis.
Correct Answer:
A
— Alcohol
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Q. What is the product of the reaction between an aldehyde and a primary amine?
A.
Imine
B.
Amide
C.
Amino acid
D.
Alcohol
Show solution
Solution
The reaction between an aldehyde and a primary amine produces an imine.
Correct Answer:
A
— Imine
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Q. What is the product of the reaction between an amine and an acyl chloride?
A.
Amide
B.
Ester
C.
Carboxylic acid
D.
Alcohol
Show solution
Solution
Amines react with acyl chlorides to form amides through a nucleophilic acyl substitution reaction.
Correct Answer:
A
— Amide
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Q. What is the product of the reaction between benzene and bromine in the presence of FeBr3?
A.
Bromobenzene
B.
Benzyl bromide
C.
Bromocyclohexane
D.
Phenol
Show solution
Solution
The reaction of benzene with bromine in the presence of a Lewis acid like FeBr3 leads to the formation of bromobenzene.
Correct Answer:
A
— Bromobenzene
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Q. What is the product of the reaction between chlorobenzene and sodium hydroxide at high temperature?
A.
Phenol
B.
Benzyl alcohol
C.
Chlorobenzene
D.
Sodium phenoxide
Show solution
Solution
Chlorobenzene reacts with sodium hydroxide in the presence of heat to form phenol via nucleophilic substitution.
Correct Answer:
A
— Phenol
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Q. What is the product of the reaction between phenol and bromine water?
A.
Bromobenzene
B.
2,4,6-tribromophenol
C.
Bromophenol
D.
Bromobutane
Show solution
Solution
Phenol reacts with bromine water to form 2,4,6-tribromophenol, a white precipitate.
Correct Answer:
B
— 2,4,6-tribromophenol
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Q. What is the product of the reaction between phenol and bromine?
A.
Bromobenzene
B.
Bromophenol
C.
Bromobutane
D.
No reaction
Show solution
Solution
Phenol reacts with bromine to form bromophenol, which is a substitution reaction.
Correct Answer:
B
— Bromophenol
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Q. What is the product of the reaction of 1-butyne with HBr?
A.
1-bromobutane
B.
2-bromobutane
C.
Butane
D.
Butyne
Show solution
Solution
The reaction of 1-butyne with HBr leads to the formation of 2-bromobutane due to Markovnikov's rule.
Correct Answer:
B
— 2-bromobutane
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Q. What is the product of the reaction of an alcohol with a carboxylic acid?
A.
Ester
B.
Ether
C.
Aldehyde
D.
Ketone
Show solution
Solution
The reaction of an alcohol with a carboxylic acid produces an ester through a process called esterification.
Correct Answer:
A
— Ester
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Q. What is the product of the reaction of chlorobenzene with sodium hydroxide at high temperature?
A.
Phenol
B.
Benzene
C.
Chlorobenzene
D.
Sodium chloride
Show solution
Solution
The reaction of chlorobenzene with sodium hydroxide at high temperature leads to the formation of phenol through nucleophilic aromatic substitution.
Correct Answer:
A
— Phenol
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Q. What is the product of the reaction of ethylene with chlorine?
A.
Ethyl chloride
B.
1,2-dichloroethane
C.
Chloroethane
D.
Ethylene dichloride
Show solution
Solution
The reaction of ethylene with chlorine results in the formation of 1,2-dichloroethane through an electrophilic addition mechanism.
Correct Answer:
B
— 1,2-dichloroethane
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Q. What is the product of the reaction of propene with HBr?
A.
1-Bromopropane
B.
2-Bromopropane
C.
Propyl bromide
D.
Bromopropene
Show solution
Solution
The reaction follows Markovnikov's rule, leading to the formation of 2-Bromopropane.
Correct Answer:
B
— 2-Bromopropane
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Q. What is the product of the roots of the equation 2x^2 + 3x - 5 = 0?
A.
-5/2
B.
5/2
C.
2/5
D.
-2/5
Show solution
Solution
The product of the roots is c/a = -5/2.
Correct Answer:
A
— -5/2
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Q. What is the product of the roots of the equation 2x^2 - 3x + 1 = 0?
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Solution
Using Vieta's formulas, the product of the roots is 1/2 (c/a = 1/2).
Correct Answer:
A
— 1/2
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Q. What is the product of the roots of the equation 3x^2 + 6x + 2 = 0?
A.
2/3
B.
1/3
C.
1/2
D.
1/6
Show solution
Solution
The product of the roots is given by c/a = 2/3.
Correct Answer:
B
— 1/3
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