Question 1

Which of these is not a correct Fischer projection formula of the (S)form of 3-bromo-1,1-dichloro-2-propanol?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 2

How is it possible to differentiate compounds in a racemic mixture?

Accepted Answer

A) by distilling of one isomer from the other 
B) through the use of IR spectroscopy 
C) chemical conversion to a diastereomeric mixture 
D) how the mixture rotates in plane polarized light 
E) it is impossible to differentiate the two compounds 
A) by distilling of one isomer from the other 
B) through the use of IR spectroscopy 
C) chemical conversion to a diastereomeric mixture 
D) how the mixture rotates in plane polarized light 
E) it is impossible to differentiate the two compounds

Question 3

The molecules below are:

Accepted Answer

A) constitutional isomers. 
B) enantiomers. 
C) diastereomers. 
D) identical. 
E) None of these choices. 
A) constitutional isomers. 
B) enantiomers. 
C) diastereomers. 
D) identical. 
E) None of these choices.

Question 4

Pairs of enantiomers are:

Accepted Answer

A) I,II and III,IV 
B) I,II 
C) III,IV 
D) IV,V 
E) None of the structures. 
A) I,II and III,IV 
B) I,II 
C) III,IV 
D) IV,V 
E) None of the structures.

Question 5

Which molecule has a plane of symmetry?

Accepted Answer

A) I 
B) II 
C) III 
D) More than one of these choices. 
E) None of these choices. 
A) I 
B) II 
C) III 
D) More than one of these choices. 
E) None of these choices.

Question 6

I and II are:

Accepted Answer

A) constitutional isomers. 
B) enantiomers. 
C) identical. 
D) diastereomers. 
E) not isomeric. 
A) constitutional isomers. 
B) enantiomers. 
C) identical. 
D) diastereomers. 
E) not isomeric.

Question 7

To be superposable,when one object is placed on top of another,___.

Accepted Answer

all parts

Question 8

If a sample is said to contain a 98.0% enantiomeric excess of the compound (+)-camphor,what would be the observed specific rotation if the pure (+)-camphor was found to have a rotation of 44.1?

Accepted Answer

The answer of If a sample is said to contain...

Question 9

The molecules shown are:

Accepted Answer

A) enantiomers. 
B) diastereomers. 
C) constitutional isomers. 
D) two conformations of the same molecule. 
E) not isomeric. 
A) enantiomers. 
B) diastereomers. 
C) constitutional isomers. 
D) two conformations of the same molecule. 
E) not isomeric.

Question 10

Draw a dash-wedge structure for (2S,3R)-3-bromo-6,6-dimethyloct-7-en-2-ol

Accepted Answer

The answer of Draw a dash-wedge structure for (2S,3R)-3-bromo-6,6-dimethyloct-7-en-2-ol...

Question 11

The molecules below are:

Accepted Answer

A) constitutional isomers. 
B) enantiomers. 
C) diastereomers. 
D) identical. 
E) None of these choices. 
A) constitutional isomers. 
B) enantiomers. 
C) diastereomers. 
D) identical. 
E) None of these choices.

Question 12

Which of the following molecules is achiral?

Accepted Answer

A) (2R,3R)-2,3-Dichloropentane 
B) (2R,3S)-2,3-Dichloropentane 
C) (2S,4S)-2,4-Dichloropentane 
D) (2S,4R)-2,4-Dichloropentane 
E) Two of these choices. 
A) (2R,3R)-2,3-Dichloropentane 
B) (2R,3S)-2,3-Dichloropentane 
C) (2S,4S)-2,4-Dichloropentane 
D) (2S,4R)-2,4-Dichloropentane 
E) Two of these choices.

Question 13

Which is a meso compound?

Accepted Answer

A) (2R,3R)-2,3-Dibromobutane 
B) (2R,3S)-2,3-Dibromopentane 
C) (2R,4R)-2,4-Dibromopentane 
D) (2R,4S)-2,4-Dibromopentane 
E) (2R,4S)-2,4-Dibromohexane 
A) (2R,3R)-2,3-Dibromobutane 
B) (2R,3S)-2,3-Dibromopentane 
C) (2R,4R)-2,4-Dibromopentane 
D) (2R,4S)-2,4-Dibromopentane 
E) (2R,4S)-2,4-Dibromohexane

Question 14

For the generalized structure BrCH2CHClCH2CHClCH2Br there exists what number of stereoisomers?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 6 
E) 8 
A) 2 
B) 3 
C) 4 
D) 6 
E) 8

Question 15

Which compound (I-IV)is a meso compound?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) None of these choices. 
A) I 
B) II 
C) III 
D) IV 
E) None of these choices.

Question 16

The molecules below are:

Accepted Answer

A) constitutional isomers. 
B) enantiomers. 
C) diastereomers. 
D) identical. 
E) None of these choices. 
A) constitutional isomers. 
B) enantiomers. 
C) diastereomers. 
D) identical. 
E) None of these choices.

Question 17

The molecule   is properly named:

Accepted Answer

A) (3R,4S,5R)-3,5-Dichloro-4-methylhexane 
B) (2S,3S,4S)-2,4-Dichloro-3-methylhexane 
C) (2S,3R,4R)-2,4-Dichloro-3-methylhexane 
D) (2S,3R,4S)-2,4-Dichloro-3-methylhexane 
E) (2S,3S,4R)-2,4-Dichloro-3-methylhexane 
A) (3R,4S,5R)-3,5-Dichloro-4-methylhexane 
B) (2S,3S,4S)-2,4-Dichloro-3-methylhexane 
C) (2S,3R,4R)-2,4-Dichloro-3-methylhexane 
D) (2S,3R,4S)-2,4-Dichloro-3-methylhexane 
E) (2S,3S,4R)-2,4-Dichloro-3-methylhexane

Question 18

Draw a dash-wedge structure for (3S,4R)-4-chloro-3,5-dimethylhex-1-yne

Accepted Answer

The answer of Draw a dash-wedge structure for (3S,4R)-4-chloro-3,5-dimethylhex-1-yne...

Question 19

A solution of which of these allenes will rotate plane-polarized light?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 20

The compounds whose molecules are shown below would have:

Accepted Answer

A) the same melting point. 
B) different melting points. 
C) equal but opposite optical rotations. 
D) More than one of these choices. 
E) None of these choices. 
A) the same melting point. 
B) different melting points. 
C) equal but opposite optical rotations. 
D) More than one of these choices. 
E) None of these choices.

Exam 5: Stereochemistry

Which of these is not a correct Fischer projection formula of the (S)form of 3-bromo-1,1-dichloro-2-propanol?

How is it possible to differentiate compounds in a racemic mixture?

The molecules below are:

Pairs of enantiomers are:

Which molecule has a plane of symmetry?

I and II are:

To be superposable,when one object is placed on top of another,___.

If a sample is said to contain a 98.0% enantiomeric excess of the compound (+)-camphor,what would be the observed specific rotation if the pure (+)-camphor was found to have a rotation of 44.1?

The molecules shown are:

Draw a dash-wedge structure for (2S,3R)-3-bromo-6,6-dimethyloct-7-en-2-ol

The molecules below are:

Which of the following molecules is achiral?

Which is a meso compound?

For the generalized structure BrCH2CHClCH2CHClCH2Br there exists what number of stereoisomers?

Which compound (I-IV)is a meso compound?

The molecules below are:

The molecule is properly named:

Draw a dash-wedge structure for (3S,4R)-4-chloro-3,5-dimethylhex-1-yne

A solution of which of these allenes will rotate plane-polarized light?

The compounds whose molecules are shown below would have:

The Basics

Families of Carbon

Acids and Bases

Nomenclature and Conformations of Alkanes and Cycloalkanes

Nucleophilic Reactions

Alkenes and Alkynes I

Alkenes and Alkynes II

Nuclear Magnetic Resonance and Mass Spectrometry

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Reactions at the Α Carbon of Carbonyl Compounds

Condensation and Conjugate Addition Reactions of Carbonyl Compounds

Amines

Transition Metal Complexes

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

For the generalized structure BrCH₂CHClCH₂CHClCH₂Br there exists what number of stereoisomers?