Major Competitive Exams MCQ & Objective Questions
Major Competitive Exams play a crucial role in shaping the academic and professional futures of students in India. These exams not only assess knowledge but also test problem-solving skills and time management. Practicing MCQs and objective questions is essential for scoring better, as they help in familiarizing students with the exam format and identifying important questions that frequently appear in tests.
What You Will Practise Here
Key concepts and theories related to major subjects
Important formulas and their applications
Definitions of critical terms and terminologies
Diagrams and illustrations to enhance understanding
Practice questions that mirror actual exam patterns
Strategies for solving objective questions efficiently
Time management techniques for competitive exams
Exam Relevance
The topics covered under Major Competitive Exams are integral to various examinations such as CBSE, State Boards, NEET, and JEE. Students can expect to encounter a mix of conceptual and application-based questions that require a solid understanding of the subjects. Common question patterns include multiple-choice questions that test both knowledge and analytical skills, making it essential to be well-prepared with practice MCQs.
Common Mistakes Students Make
Rushing through questions without reading them carefully
Overlooking the negative marking scheme in MCQs
Confusing similar concepts or terms
Neglecting to review previous years’ question papers
Failing to manage time effectively during the exam
FAQs
Question: How can I improve my performance in Major Competitive Exams?Answer: Regular practice of MCQs and understanding key concepts will significantly enhance your performance.
Question: What types of questions should I focus on for these exams?Answer: Concentrate on important Major Competitive Exams questions that frequently appear in past papers and mock tests.
Question: Are there specific strategies for tackling objective questions?Answer: Yes, practicing under timed conditions and reviewing mistakes can help develop effective strategies.
Start your journey towards success by solving practice MCQs today! Test your understanding and build confidence for your upcoming exams. Remember, consistent practice is the key to mastering Major Competitive Exams!
Q. What is the main product of the reaction of 1-bromo-2-methylpropane with KOH in ethanol? (2020)
A.
2-methylpropene
B.
2-methylpropan-1-ol
C.
1-bromo-2-methylpropane
D.
2-bromo-2-methylpropane
Show solution
Solution
The reaction of 1-bromo-2-methylpropane with KOH in ethanol leads to the formation of 2-methylpropene through an elimination reaction.
Correct Answer:
A
— 2-methylpropene
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Q. What is the main product of the reaction of 1-chloropropane with magnesium in dry ether?
A.
Propane
B.
Grignard reagent
C.
Propyl chloride
D.
Magnesium chloride
Show solution
Solution
The reaction forms a Grignard reagent, which is an organomagnesium compound.
Correct Answer:
B
— Grignard reagent
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Q. What is the main product of the reaction of benzene with bromine in the presence of FeBr3?
A.
Bromobenzene
B.
Benzyl bromide
C.
Bromobenzyl alcohol
D.
Benzene remains unchanged
Show solution
Solution
The reaction of benzene with bromine in the presence of FeBr3 leads to the formation of bromobenzene through electrophilic aromatic substitution.
Correct Answer:
A
— Bromobenzene
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Q. What is the main product of the reaction of ethene with ozone followed by zinc reduction?
A.
Acetaldehyde
B.
Ethylene glycol
C.
Acetic acid
D.
Ethane
Show solution
Solution
The ozonolysis of ethene followed by zinc reduction yields acetaldehyde.
Correct Answer:
A
— Acetaldehyde
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Q. What is the main product of the thermal decomposition of ammonium dichromate? (2023)
A.
Cr2O3
B.
CrO3
C.
Cr
D.
NH3
Show solution
Solution
The thermal decomposition of ammonium dichromate produces chromium(III) oxide (Cr2O3) as the main product.
Correct Answer:
A
— Cr2O3
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Q. What is the main product of the thermal decomposition of calcium carbonate (CaCO3)? (2019)
A.
Calcium oxide (CaO)
B.
Carbon dioxide (CO2)
C.
Calcium hydroxide (Ca(OH)2)
D.
Calcium carbide (CaC2)
Show solution
Solution
The thermal decomposition of calcium carbonate produces calcium oxide (CaO) and carbon dioxide (CO2).
Correct Answer:
A
— Calcium oxide (CaO)
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Q. What is the main product of the thermal decomposition of calcium carbonate?
A.
Calcium oxide
B.
Calcium hydroxide
C.
Carbon dioxide
D.
Calcium bicarbonate
Show solution
Solution
The thermal decomposition of calcium carbonate produces calcium oxide and carbon dioxide.
Correct Answer:
A
— Calcium oxide
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Q. What is the main product when 1-bromobutane reacts with sodium hydroxide in ethanol? (2021)
A.
Butanol
B.
Butene
C.
Sodium bromide
D.
Butyric acid
Show solution
Solution
The reaction of 1-bromobutane with sodium hydroxide in ethanol leads to elimination, forming butene as the main product.
Correct Answer:
B
— Butene
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Q. What is the main product when 1-bromopropane is treated with alcoholic KOH? (2021)
A.
Propene
B.
1-propanol
C.
2-propanol
D.
Bromopropane
Show solution
Solution
Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-bromopropane.
Correct Answer:
A
— Propene
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Q. What is the main product when 1-bromopropane is treated with aqueous KOH?
A.
Propene
B.
1-propanol
C.
2-propanol
D.
No reaction
Show solution
Solution
1-bromopropane reacts with aqueous KOH to undergo substitution, yielding 1-propanol as the main product.
Correct Answer:
B
— 1-propanol
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Q. What is the main product when 1-bromopropane is treated with magnesium in dry ether? (2019)
A.
Propane
B.
Grignard reagent
C.
Bromopropane
D.
Propyl alcohol
Show solution
Solution
The reaction of 1-bromopropane with magnesium in dry ether forms the Grignard reagent, propylmagnesium bromide.
Correct Answer:
B
— Grignard reagent
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Q. What is the main product when 1-bromopropane reacts with magnesium in dry ether?
A.
Propylmagnesium bromide
B.
Propane
C.
Magnesium bromide
D.
Propan-1-ol
Show solution
Solution
The reaction of 1-bromopropane with magnesium in dry ether forms propylmagnesium bromide, a Grignard reagent.
Correct Answer:
A
— Propylmagnesium bromide
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Q. What is the main product when 1-butanol is oxidized?
A.
Butanal
B.
Butanoic acid
C.
Butene
D.
Butyne
Show solution
Solution
Oxidation of 1-butanol leads to the formation of butanoic acid.
Correct Answer:
B
— Butanoic acid
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Q. What is the main product when 1-butene undergoes hydroboration-oxidation?
A.
Butanol
B.
Butanal
C.
Butyric acid
D.
Butene
Show solution
Solution
The main product of hydroboration-oxidation of 1-butene is butanol.
Correct Answer:
A
— Butanol
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Q. What is the main product when 1-butyne is treated with HBr?
A.
1-bromobutane
B.
2-bromobutane
C.
1,2-dibromobutane
D.
No reaction
Show solution
Solution
When 1-butyne reacts with HBr, the main product is 2-bromobutane due to Markovnikov's rule.
Correct Answer:
B
— 2-bromobutane
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Q. What is the main product when 1-chloropropane is treated with alcoholic KOH? (2019)
A.
Propene
B.
Propan-1-ol
C.
Propan-2-ol
D.
Chloropropane
Show solution
Solution
Alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.
Correct Answer:
A
— Propene
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Q. What is the main product when 1-chloropropane is treated with aqueous KOH? (2019)
A.
Propene
B.
Propan-1-ol
C.
Propan-2-ol
D.
Chloropropane
Show solution
Solution
The treatment of 1-chloropropane with aqueous KOH leads to the formation of propan-1-ol through nucleophilic substitution.
Correct Answer:
B
— Propan-1-ol
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Q. What is the main product when 1-chloropropane is treated with excess alcoholic KOH? (2020)
A.
Propene
B.
1-Propanol
C.
2-Propanol
D.
Chloropropane
Show solution
Solution
Excess alcoholic KOH promotes elimination reactions, leading to the formation of propene from 1-chloropropane.
Correct Answer:
A
— Propene
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Q. What is the main product when 1-chloropropane is treated with magnesium in dry ether?
A.
Propane
B.
Propylmagnesium chloride
C.
Cyclopropane
D.
Chloromagnesium propyl
Show solution
Solution
The reaction forms propylmagnesium chloride, a Grignard reagent.
Correct Answer:
B
— Propylmagnesium chloride
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Q. What is the main product when 2-butyne is treated with excess H2 in the presence of a catalyst?
A.
1-butyne
B.
Butane
C.
2-butyne
D.
Ethyne
Show solution
Solution
The main product is butane, as 2-butyne is fully hydrogenated to form butane.
Correct Answer:
B
— Butane
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Q. What is the main product when 2-butyne undergoes hydroboration-oxidation?
A.
Butanol
B.
Butanal
C.
Butyric acid
D.
Butene
Show solution
Solution
The main product is Butanol when 2-butyne undergoes hydroboration-oxidation.
Correct Answer:
A
— Butanol
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Q. What is the main product when a carboxylic acid is reduced?
A.
Alcohol
B.
Aldehyde
C.
Ketone
D.
Alkane
Show solution
Solution
The main product of the reduction of a carboxylic acid is an alcohol.
Correct Answer:
A
— Alcohol
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Q. What is the main product when aluminum reacts with hydrochloric acid? (2023)
A.
AlCl3
B.
H2
C.
Al(OH)3
D.
Al2Cl6
Show solution
Solution
When aluminum reacts with hydrochloric acid, hydrogen gas (H2) is produced along with aluminum chloride (AlCl3).
Correct Answer:
B
— H2
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Q. What is the main product when an alcohol is dehydrated?
A.
Alkene
B.
Alkane
C.
Ether
D.
Aldehyde
Show solution
Solution
Dehydration of alcohols typically yields alkenes through elimination reactions.
Correct Answer:
A
— Alkene
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Q. What is the main product when an alcohol is oxidized with potassium dichromate?
A.
Aldehyde
B.
Ketone
C.
Carboxylic acid
D.
All of the above
Show solution
Solution
Depending on the type of alcohol, oxidation with potassium dichromate can yield aldehydes, ketones, or carboxylic acids.
Correct Answer:
D
— All of the above
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Q. What is the main product when an alcohol is oxidized?
A.
Alkane
B.
Aldehyde
C.
Ketone
D.
Carboxylic acid
Show solution
Solution
The oxidation of a primary alcohol typically produces a carboxylic acid.
Correct Answer:
D
— Carboxylic acid
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Q. What is the main product when an alcohol undergoes dehydration?
A.
Alkane
B.
Alkene
C.
Alkyne
D.
Ether
Show solution
Solution
Dehydration of an alcohol typically produces an alkene.
Correct Answer:
B
— Alkene
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Q. What is the main product when an aldehyde is treated with sodium bisulfite? (2019)
A.
Aldol
B.
Bisulfite adduct
C.
Hydrocarbon
D.
Alcohol
Show solution
Solution
The main product formed when an aldehyde reacts with sodium bisulfite is a bisulfite adduct.
Correct Answer:
B
— Bisulfite adduct
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Q. What is the main product when an aldehyde reacts with a Grignard reagent?
A.
Alcohol
B.
Ketone
C.
Carboxylic acid
D.
Alkane
Show solution
Solution
The reaction of an aldehyde with a Grignard reagent produces a primary alcohol after hydrolysis.
Correct Answer:
A
— Alcohol
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Q. What is the main product when an alkene undergoes hydrohalogenation?
A.
Alcohol
B.
Haloalkane
C.
Alkane
D.
Alkyl halide
Show solution
Solution
The main product of hydrohalogenation of an alkene is a haloalkane.
Correct Answer:
B
— Haloalkane
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