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

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Questions
1 Which of the following is the definition for enatiomerism?
A A pair of stereoisomers each of which has two chirality centres
B A pair of stereoisomers that are not mirror images of one another
C A pair of stereoisomers that are non-superimposable mirror images of one another
D Any pair of stereoisomers

Answer:A pair of stereoisomers that are non-superimposable mirror images of one another
2 Which of the following statements is not true regarding pairs of enantiomers?
A They have identical boiling points
B They rotate plane polarized light in opposite directions
C They react at identical rates with chiral reagents
D They have identical melting points

Answer:They rotate plane polarized light in opposite directions
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3 Which of the following statements regarding optical rotation is not true?
A All R enantiomers are dextrorotatory
B All (+) enantiomers are laevorotatory
C All (-) enantiomers rotate plane polarized light in a counter clockwise direction
D (+) and (-) enantiomers rotate plane polarized light in opposite directions

Answer:All (-) enantiomers rotate plane polarized light in a counter clockwise direction
4 How many enantiomers are there of the molecule shown below?

Organic Chemistry

A 6
B 2
C 0
D 1

Answer:0
5 Which of the following notations is not used to distinguish between pairs of enantiomers?
A R and S
B E and Z
C + and –
D D and L

Answer:E and Z
6 Which among the following is true about enantiomerism?
A Assignments of R and S labels and (+) and (–) labels are not connected
B The labels R and S refer to different conformers
C The labels (+) and (–) are used to distinguish enantiomers
D The specific rotation of enantiomers is equal and opposite

Answer:The labels R and S refer to different conformers
7 Which of the following molecules does not possess enantiomers?
A CH3CH2CH2CHBrCH3
B CH3CH2CBr2CH3
C CH3CHBrCH2CH3
D CHBr2CH2CHBrCH3

Answer:CH3CH2CBr2CH3
8 Which of the following is true of any (S)-enantiomerism?
A It rotates plane-polarized light to the right
B It rotates plane-polarized light to the left
C It is a racemic form
D It is the mirror image of the corresponding (R)-enantiomer

Answer:It is the mirror image of the corresponding (R)-enantiomer
9 Which of the following is not true of enantiomers?
A boiling point
B melting point
C specific rotation
D density

Answer:specific rotation
10 In the absence of specific data, it can only be said that (R)–2–bromopentane is which of the following?
A dextrorotatory (+)
B levorotatory (–)
C optically inactive
D analogous in absolute configuration to (R)–2–chloropentane

Answer:analogous in absolute configuration to (R)–2–chloropentane

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