Q. Which of the following is an example of chain isomerism?
A.
Pentane and 2-methylbutane
B.
Butene and Butyne
C.
Ethanol and Dimethyl ether
D.
Acetic acid and Propanoic acid
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Solution
Pentane and 2-methylbutane differ in the arrangement of carbon atoms, thus showing chain isomerism.
Correct Answer:
A
— Pentane and 2-methylbutane
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Q. Which of the following is an example of cis-trans isomerism?
A.
1-pentene
B.
2-pentene
C.
3-pentene
D.
Cyclopentane
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Solution
2-pentene can exist in cis and trans forms due to the presence of a double bond.
Correct Answer:
B
— 2-pentene
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Q. Which of the following is an example of optical isomerism?
A.
Lactic acid
B.
Butane
C.
Cyclohexane
D.
Acetone
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Solution
Lactic acid has a chiral center and can exist as two enantiomers, thus exhibiting optical isomerism.
Correct Answer:
A
— Lactic acid
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Q. Which of the following is an example of structural isomerism?
A.
Cis-2-butene and trans-2-butene
B.
1-bromopropane and 2-bromopropane
C.
Glucose and fructose
D.
1,2-dichloroethane and 1,1-dichloroethane
Show solution
Solution
1-bromopropane and 2-bromopropane differ in the position of the bromine atom, showing structural isomerism.
Correct Answer:
B
— 1-bromopropane and 2-bromopropane
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Q. Which of the following is an example of tautomeric isomerism?
A.
Acetaldehyde and Ethanol
B.
Acetone and Propan-2-ol
C.
Keto-enol tautomerism
D.
Cis and Trans isomers
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Solution
Keto-enol tautomerism is a classic example of tautomeric isomerism.
Correct Answer:
C
— Keto-enol tautomerism
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Q. Which of the following is NOT a type of isomerism?
A.
Geometric isomerism
B.
Optical isomerism
C.
Hydrogen isomerism
D.
Structural isomerism
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Solution
Hydrogen isomerism is not a recognized type of isomerism in chemistry.
Correct Answer:
C
— Hydrogen isomerism
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Q. Which of the following pairs are enantiomers?
A.
D-Glucose and L-Glucose
B.
C2H6 and C2H5OH
C.
n-Butane and Isobutane
D.
C3H8 and C3H6
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Solution
D-Glucose and L-Glucose are mirror images of each other, making them enantiomers.
Correct Answer:
A
— D-Glucose and L-Glucose
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Q. Which of the following pairs are structural isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-pentanol and 2-pentanol
C.
Ethylene and acetylene
D.
Glucose and galactose
Show solution
Solution
1-pentanol and 2-pentanol differ in the position of the hydroxyl group, making them structural isomers.
Correct Answer:
B
— 1-pentanol and 2-pentanol
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Q. Which of the following pairs of compounds are enantiomers?
A.
D-Glucose and L-Glucose
B.
Cis-2-butene and Trans-2-butene
C.
1-butanol and 2-butanol
D.
Acetic acid and Propanoic acid
Show solution
Solution
D-Glucose and L-Glucose are mirror images of each other, making them enantiomers.
Correct Answer:
A
— D-Glucose and L-Glucose
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Q. Which of the following pairs of compounds are functional isomers?
A.
C2H6 and C2H5OH
B.
C3H8 and C3H6
C.
C4H10 and C4H8
D.
C5H12 and C5H10
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Solution
C2H6 (ethane) and C2H5OH (ethanol) have different functional groups, making them functional isomers.
Correct Answer:
A
— C2H6 and C2H5OH
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Q. Which of the following pairs of compounds are geometric isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-butanol and 2-butanol
C.
Ethylene and acetylene
D.
Cyclohexane and hexane
Show solution
Solution
Cis-2-butene and trans-2-butene differ in the arrangement of groups around the double bond, making them geometric isomers.
Correct Answer:
A
— Cis-2-butene and trans-2-butene
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Q. Which of the following pairs of compounds are structural isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-pentanol and 2-pentanol
C.
Ethyl alcohol and dimethyl ether
D.
Glucose and galactose
Show solution
Solution
Ethyl alcohol (ethanol) and dimethyl ether have the same molecular formula but different structures.
Correct Answer:
C
— Ethyl alcohol and dimethyl ether
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Q. Which of the following statements about isomerism is FALSE?
A.
Isomers have the same molecular formula.
B.
Isomers have different physical properties.
C.
Isomers have different chemical properties.
D.
Isomers cannot exist in the same physical state.
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Solution
Isomers can exist in the same physical state, such as liquid or solid.
Correct Answer:
D
— Isomers cannot exist in the same physical state.
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Q. Which of the following statements about isomerism is true?
A.
Isomers have the same molecular formula
B.
Isomers have different molecular formulas
C.
Isomers have the same physical properties
D.
Isomers cannot exist in the same compound
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Solution
Isomers have the same molecular formula but differ in the arrangement of atoms.
Correct Answer:
A
— Isomers have the same molecular formula
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Q. Which of the following statements about isomers is true?
A.
Isomers have different molecular formulas
B.
Isomers have the same connectivity of atoms
C.
Isomers have different physical and chemical properties
D.
Isomers cannot exist in the same compound
Show solution
Solution
Isomers can have different physical and chemical properties despite having the same molecular formula.
Correct Answer:
C
— Isomers have different physical and chemical properties
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Q. Which of the following statements about optical isomers is true?
A.
They have the same physical properties
B.
They rotate plane-polarized light in opposite directions
C.
They have different molecular formulas
D.
They are always chiral
Show solution
Solution
Optical isomers, or enantiomers, rotate plane-polarized light in opposite directions.
Correct Answer:
B
— They rotate plane-polarized light in opposite directions
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Q. Which of the following statements is true regarding optical isomers?
A.
They are superimposable
B.
They have identical physical properties
C.
They rotate plane-polarized light in opposite directions
D.
They have different molecular formulas
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Solution
Optical isomers, or enantiomers, rotate plane-polarized light in opposite directions.
Correct Answer:
C
— They rotate plane-polarized light in opposite directions
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Q. Which type of isomerism is exhibited by 1,2-dichloroethene?
A.
Structural isomerism
B.
Geometric isomerism
C.
Optical isomerism
D.
Conformational isomerism
Show solution
Solution
1,2-dichloroethene can exist in cis and trans forms, demonstrating geometric isomerism.
Correct Answer:
B
— Geometric isomerism
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Q. Which type of isomerism is exhibited by 1,3-butadiene?
A.
Geometric isomerism
B.
Structural isomerism
C.
Conformational isomerism
D.
Optical isomerism
Show solution
Solution
1,3-butadiene can exhibit geometric isomerism due to the presence of double bonds.
Correct Answer:
A
— Geometric isomerism
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Q. Which type of isomerism is exhibited by glucose and fructose?
A.
Geometric isomerism
B.
Structural isomerism
C.
Optical isomerism
D.
Conformational isomerism
Show solution
Solution
Glucose and fructose are structural isomers as they have the same molecular formula but different structures.
Correct Answer:
B
— Structural isomerism
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Q. Which type of isomerism is shown by butane (C4H10)?
A.
Geometric isomerism
B.
Structural isomerism
C.
Optical isomerism
D.
Tautomeric isomerism
Show solution
Solution
Butane exhibits structural isomerism as it can exist as n-butane and isobutane.
Correct Answer:
B
— Structural isomerism
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Showing 31 to 51 of 51 (2 Pages)
Isomerism MCQ & Objective Questions
Isomerism is a crucial topic in chemistry that plays a significant role in various examinations. Understanding isomerism not only enhances your conceptual clarity but also boosts your confidence in tackling MCQs and objective questions. By practicing isomerism MCQ questions, you can identify important questions that frequently appear in exams, thereby improving your exam preparation and scoring potential.
What You Will Practise Here
Types of isomerism: structural isomerism and stereoisomerism
Key definitions and examples of isomers
Understanding geometric and optical isomerism
Important isomerism concepts related to organic compounds
Diagrams illustrating different isomeric forms
Formulas related to isomerism and their applications
Practice questions on isomerism with detailed explanations
Exam Relevance
The topic of isomerism is frequently tested in CBSE, State Boards, NEET, and JEE. Students can expect questions that require them to identify different types of isomers, explain their properties, and solve problems related to isomeric compounds. Common question patterns include multiple-choice questions that ask for the identification of isomers from given molecular formulas or structures, making it essential to grasp the concepts thoroughly.
Common Mistakes Students Make
Confusing structural isomers with stereoisomers
Overlooking the significance of functional groups in isomerism
Misinterpreting the spatial arrangement in geometric isomers
Failing to apply the correct nomenclature for isomers
Neglecting to practice diagram-based questions
FAQs
Question: What are the main types of isomerism?Answer: The main types of isomerism are structural isomerism and stereoisomerism, which include geometric and optical isomerism.
Question: How can I improve my understanding of isomerism for exams?Answer: Regular practice of isomerism MCQ questions and reviewing key concepts will significantly enhance your understanding and retention.
Don't miss the opportunity to strengthen your grasp on isomerism! Start solving practice MCQs today and test your understanding to excel in your exams.
