Organic Chemistry Objective Questions and Answers | Organic Chemistry MCQs and Answers

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

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