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

Questions
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?

Organic Chemistry

A 1
B 2
C 3
D 4

Answer:4
4 Which of the following terms best describes the following pair of molecules?

Organic Chemistry

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?

Organic Chemistry

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?

Organic Chemistry

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?

Organic Chemistry

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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