Q. Which quantum number determines the shape of an atomic orbital?
A.
Principal quantum number (n)
B.
Azimuthal quantum number (l)
C.
Magnetic quantum number (m_l)
D.
Spin quantum number (m_s)
Show solution
Solution
The azimuthal quantum number (l) determines the shape of the orbital.
Correct Answer:
B
— Azimuthal quantum number (l)
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Q. Which quantum number is associated with the orientation of an orbital?
A.
Principal quantum number (n)
B.
Azimuthal quantum number (l)
C.
Magnetic quantum number (m_l)
D.
Spin quantum number (m_s)
Show solution
Solution
The magnetic quantum number (m_l) describes the orientation of an orbital in space.
Correct Answer:
C
— Magnetic quantum number (m_l)
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Q. Which quantum number is not allowed to be negative?
A.
Principal quantum number (n)
B.
Azimuthal quantum number (l)
C.
Magnetic quantum number (m)
D.
Spin quantum number (s)
Show solution
Solution
The principal quantum number (n) cannot be negative; it must be a positive integer.
Correct Answer:
A
— Principal quantum number (n)
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Q. Which reaction involves the addition of water to an alkene?
A.
Hydrogenation
B.
Hydrolysis
C.
Hydration
D.
Dehydration
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Solution
The addition of water to an alkene is called hydration.
Correct Answer:
C
— Hydration
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Q. Which reaction is characteristic of alkenes?
A.
Hydrogenation
B.
Halogenation
C.
Hydrolysis
D.
Oxidation
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Solution
Alkenes readily undergo halogenation due to the presence of a double bond.
Correct Answer:
B
— Halogenation
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Q. Which reaction is characteristic of alkynes?
A.
Hydrogenation
B.
Halogenation
C.
Hydrohalogenation
D.
All of the above
Show solution
Solution
Alkynes can undergo hydrogenation, halogenation, and hydrohalogenation.
Correct Answer:
D
— All of the above
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Q. Which reaction is commonly used to convert alkynes to alkenes?
A.
Hydrogenation
B.
Halogenation
C.
Hydroboration
D.
Dehydrohalogenation
Show solution
Solution
Hydrogenation is used to convert alkynes to alkenes.
Correct Answer:
A
— Hydrogenation
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Q. Which reaction is used to convert alkenes to alkanes?
A.
Hydrogenation
B.
Halogenation
C.
Hydrolysis
D.
Dehydrogenation
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Solution
Hydrogenation is the process of adding hydrogen to alkenes to convert them into alkanes.
Correct Answer:
A
— Hydrogenation
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Q. Which reaction is used to prepare alkynes from alkenes?
A.
Hydrogenation
B.
Dehydrohalogenation
C.
Hydrohalogenation
D.
Halogenation
Show solution
Solution
Dehydrohalogenation of vicinal dihalides can be used to prepare alkynes from alkenes.
Correct Answer:
B
— Dehydrohalogenation
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Q. Which reagent can be used to convert a haloalkane into an alcohol?
A.
Sodium hydroxide
B.
Sodium chloride
C.
Sodium bromide
D.
Sodium acetate
Show solution
Solution
Sodium hydroxide (NaOH) can be used to perform nucleophilic substitution, converting haloalkanes into alcohols.
Correct Answer:
A
— Sodium hydroxide
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Q. Which reagent can be used to convert a haloalkane to an alcohol?
A.
Sodium hydroxide
B.
Sodium metal
C.
Hydrochloric acid
D.
Bromine
Show solution
Solution
Sodium hydroxide can be used to convert haloalkanes to alcohols through nucleophilic substitution.
Correct Answer:
A
— Sodium hydroxide
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Q. Which reagent can be used to convert an alkyne to a diketone?
A.
KMnO4
B.
O3
C.
H2O
D.
H2SO4
Show solution
Solution
Ozonolysis of an alkyne can yield a diketone.
Correct Answer:
B
— O3
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Q. Which reagent can be used to convert an alkyne to a ketone?
A.
H2O/H2SO4
B.
LiAlH4
C.
B2H6
D.
KMnO4
Show solution
Solution
The hydration of an alkyne using H2O in the presence of H2SO4 leads to the formation of a ketone.
Correct Answer:
A
— H2O/H2SO4
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Q. Which reagent can be used to distinguish between an alkyne and an alkene?
A.
Bromine water
B.
Sodium metal
C.
Potassium permanganate
D.
Hydrochloric acid
Show solution
Solution
Bromine water can be used to distinguish between an alkyne and an alkene, as alkynes will decolorize it.
Correct Answer:
A
— Bromine water
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Q. Which reagent can be used to test for the presence of alkenes?
A.
Bromine water
B.
Silver nitrate
C.
Sodium hydroxide
D.
Hydrochloric acid
Show solution
Solution
Bromine water is used to test for alkenes; it will decolorize in the presence of a double bond.
Correct Answer:
A
— Bromine water
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Q. Which reagent is commonly used for the Friedel-Crafts alkylation of benzene?
A.
AlCl3
B.
H2SO4
C.
NaOH
D.
KMnO4
Show solution
Solution
Aluminum chloride (AlCl3) is commonly used as a catalyst in Friedel-Crafts alkylation reactions to introduce alkyl groups onto benzene.
Correct Answer:
A
— AlCl3
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Q. Which reagent is commonly used for the hydrogenation of alkenes?
A.
H2/Pt
B.
H2O
C.
Br2
D.
NaOH
Show solution
Solution
H2 in the presence of a catalyst like platinum (Pt) is commonly used for the hydrogenation of alkenes.
Correct Answer:
A
— H2/Pt
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Q. Which reagent is commonly used for the ozonolysis of alkenes?
A.
KMnO4
B.
O3
C.
H2O2
D.
NaBH4
Show solution
Solution
Ozonolysis of alkenes is performed using ozone (O3) to cleave the double bond and form carbonyl compounds.
Correct Answer:
B
— O3
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Q. Which reagent is commonly used in the nitration of benzene?
A.
H2SO4
B.
HNO3
C.
HCl
D.
NaOH
Show solution
Solution
In the nitration of benzene, a mixture of concentrated nitric acid (HNO3) and sulfuric acid (H2SO4) is used to introduce a nitro group.
Correct Answer:
B
— HNO3
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Q. Which reagent is commonly used to convert a carboxylic acid to an acid chloride?
A.
SOCl2
B.
PCl5
C.
PCl3
D.
All of the above
Show solution
Solution
All of the listed reagents can convert carboxylic acids to acid chlorides.
Correct Answer:
D
— All of the above
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Q. Which reagent is commonly used to convert a carboxylic acid to an alcohol?
A.
LiAlH4
B.
NaBH4
C.
H2/Pd
D.
SOCl2
Show solution
Solution
Lithium aluminum hydride (LiAlH4) is a strong reducing agent that can reduce carboxylic acids to primary alcohols.
Correct Answer:
A
— LiAlH4
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Q. Which reagent is commonly used to convert alcohols to alkyl halides?
A.
SOCl2
B.
HCl
C.
PBr3
D.
All of the above
Show solution
Solution
All of the listed reagents (SOCl2, HCl, PBr3) can be used to convert alcohols to alkyl halides.
Correct Answer:
D
— All of the above
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Q. Which reagent is commonly used to convert alkynes to alkenes?
A.
H2/Pd
B.
LiAlH4
C.
Br2
D.
KMnO4
Show solution
Solution
Hydrogenation using H2 in the presence of a catalyst like Pd converts alkynes to alkenes.
Correct Answer:
A
— H2/Pd
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Q. Which reagent is commonly used to convert an alcohol to an alkyl halide?
A.
HCl
B.
NaOH
C.
H2SO4
D.
K2Cr2O7
Show solution
Solution
Hydrochloric acid (HCl) is commonly used to convert alcohols to alkyl halides through a substitution reaction.
Correct Answer:
A
— HCl
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Q. Which reagent is commonly used to convert an aldehyde to a primary alcohol?
A.
KMnO4
B.
LiAlH4
C.
NaBH4
D.
H2SO4
Show solution
Solution
Sodium borohydride (NaBH4) is commonly used to reduce aldehydes to primary alcohols.
Correct Answer:
C
— NaBH4
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Q. Which reagent is commonly used to convert an alkyne to a cis-alkene?
A.
H2/Pd
B.
H2/Lindlar's catalyst
C.
LiAlH4
D.
NaNH2
Show solution
Solution
H2 in the presence of Lindlar's catalyst is used to convert alkynes to cis-alkenes.
Correct Answer:
B
— H2/Lindlar's catalyst
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Q. Which reagent is commonly used to convert carboxylic acids to alcohols?
A.
LiAlH4
B.
NaBH4
C.
H2/Pd
D.
SOCl2
Show solution
Solution
Lithium aluminum hydride (LiAlH4) is used to reduce carboxylic acids to alcohols.
Correct Answer:
A
— LiAlH4
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Q. Which reagent is commonly used to convert haloalkanes to alcohols?
A.
Sodium hydroxide
B.
Sodium chloride
C.
Potassium bromide
D.
Calcium carbonate
Show solution
Solution
Sodium hydroxide is a strong base that can effectively convert haloalkanes to alcohols through nucleophilic substitution.
Correct Answer:
A
— Sodium hydroxide
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Q. Which reagent is commonly used to distinguish between aldehydes and ketones?
A.
Benedict's solution
B.
Tollens' reagent
C.
Fehling's solution
D.
All of the above
Show solution
Solution
All of the mentioned reagents can be used to distinguish between aldehydes and ketones, as aldehydes can be oxidized while ketones cannot.
Correct Answer:
D
— All of the above
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Q. Which reagent is commonly used to oxidize aldehydes to carboxylic acids?
A.
KMnO4
B.
NaBH4
C.
LiAlH4
D.
H2
Show solution
Solution
Potassium permanganate (KMnO4) is a strong oxidizing agent that can oxidize aldehydes to carboxylic acids.
Correct Answer:
A
— KMnO4
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Chemistry Syllabus (JEE Main) MCQ & Objective Questions
The Chemistry Syllabus for JEE Main is crucial for students aiming to excel in their exams. Understanding this syllabus not only helps in grasping fundamental concepts but also enhances performance in objective questions and MCQs. Regular practice with these types of questions is essential for scoring better and mastering important topics.
What You Will Practise Here
Basic Concepts of Chemistry
Atomic Structure and Chemical Bonding
States of Matter: Gases and Liquids
Thermodynamics and Thermochemistry
Equilibrium: Chemical and Ionic
Redox Reactions and Electrochemistry
Hydrocarbons and Environmental Chemistry
Exam Relevance
The Chemistry syllabus is a significant part of CBSE, State Boards, NEET, and JEE exams. Questions from this syllabus often appear in various formats, including multiple-choice questions, assertion-reason type questions, and numerical problems. Familiarity with the common question patterns can greatly enhance your exam preparation and confidence.
Common Mistakes Students Make
Misunderstanding the periodic trends and their implications.
Confusing different types of chemical bonds and their properties.
Neglecting to balance redox reactions properly.
Overlooking the significance of units in thermodynamic calculations.
Failing to apply concepts of equilibrium in problem-solving.
FAQs
Question: What are the key topics I should focus on in the Chemistry syllabus for JEE Main?Answer: Focus on atomic structure, chemical bonding, thermodynamics, and equilibrium as they are frequently tested.
Question: How can I improve my performance in Chemistry MCQs?Answer: Regular practice with past papers and understanding concepts deeply will help you tackle MCQs effectively.
Start your journey towards mastering the Chemistry Syllabus (JEE Main) by solving practice MCQs today. Test your understanding and build confidence for your exams!