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Organic Chemistry Questions and Answers – Stereochemistry | Organic Chemistry Multiple Choice Questions and Answers

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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Compounds which have different arrangements of atoms in space while having same atoms bonded to each other are said to have
[A] position isomerism
[B] functional group isomerism
[C] chain isomerism
[D] stereoisomerism
Answer: stereoisomerism
(2) Which of the following can make difference in optical isomers?
[A] heat
[B] temperature
[C] polarized light
[D] pressure
Answer: polarized light

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(3) Which of the following Fischer projections is different from the other three?

[A] 1
[B] 2
[C] 3
[D] 4
Answer: 4
(4) Which of the following terms best describes the following pair of molecules?

[A] Isomers
[B] Constitutional isomers
[C] Configurational isomers
[D] Geometrical isomers
Answer: Geometrical isomers
(5) What is the relationship between the two groups in the following molecules?

[A] They are equatorial to one another
[B] They are axial to one another
[C] They are cis to one another
[D] They are trans to one another
Answer: They are trans to one another
(6) What is the stereochemical relationship between the following two molecules?

[A] Geometrical isomers
[B] Enantiomers
[C] Diastereomers
[D] Identical
Answer: Identical
(7) Which of the following is an alkane which can exhibit optical activity?
[A] Neopentane
[B] Isopentane
[C] 3–Methylpentane
[D] 3–Methylhexane
Answer: 3–Methylhexane
(8) What is the molecular formula for the alkane of smallest molecular weight which possesses a stereogenic center?
[A] C4H10
[B] C5H12
[C] C6H14
[D] C7H16
Answer: C7H16
(9) Which of the following statements most accurately describes the stereochemistry between the various cyclohexanes?
[A] Cis-1,2-dichlorocyclohexane and trans-1,2-dichlorocyclohexane rotate plane-polarized light in opposite directions, and together in equal proportions form a racemic mixture
[B] The diaxial and diequatorial forms of trans-1,3-dichlorohexane can be separated by their differing physical properties
[C] Only cis-1,4-dichlorocyclohexane is achiral due to a plane of symmetry, and cis-1,4-dichlorocyclohexane is diastereomeric to trans-1,4-dichlorocyclohexane
[D] The conformational isomers of trans-1,2-dichlorocyclohexane are enantiomers, which are not interconvertible, but resolvable
Answer: The conformational isomers of trans-1,2-dichlorocyclohexane are enantiomers, which are not interconvertible, but resolvable
(10) Which of the following statements can be deduced about the stereochemistry of this compound?

[A] This compound is optically active because it has stereogenic centers that create cis-trans isomers
[B] This compound is optically active because the compound contains a center, plane, or axis of chirality
[C] This compound is not optically active since there are no stereogenic centers
[D] This compound is not optically active because of its symmetry
Answer: This compound is optically active because it has stereogenic centers that create cis-trans isomers

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