MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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» E. | |
| 2. |
Which of the following is not true of enantiomers? |
| A. | boiling point |
| B. | melting point |
| C. | specific rotation |
| D. | density |
| Answer» D. density | |
| 3. |
How many enantiomers are there of the molecule shown below? |
| A. | 6 |
| B. | 2 |
| C. | 0 |
| D. | 1 |
| Answer» D. 1 | |
| 4. |
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» D. Any pair of stereoisomers | |
| 5. |
WHICH_OF_THE_FOLLOWING_IS_NOT_TRUE_OF_ENANTIOMERS?_THEY_HAVE_THE_SAME:?$ |
| A. | boiling point |
| B. | melting point |
| C. | specific rotation |
| D. | density |
| Answer» D. density | |
| 6. |
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» E. | |
| 7. |
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» E. | |
| 8. |
Which of the following molecules does not possess enantiomers? |
| A. | CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CHBrCH<sub>3</sub> |
| B. | CH<sub>3</sub>CH<sub>2</sub>CBr<sub>2</sub>CH<sub>3</sub> |
| C. | CH<sub>3</sub>CHBrCH<sub>2</sub>CH<sub>3</sub> |
| D. | CHBr<sub>2</sub>CH<sub>2</sub>CHBrCH<sub>3</sub> |
| Answer» C. CH<sub>3</sub>CHBrCH<sub>2</sub>CH<sub>3</sub> | |
| 9. |
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» C. The labels (+) and (‚Äö√Ñ√∂‚àö√ë‚àö¬®) are used to distinguish enantiomers | |
| 10. |
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» C. + and ‚Äö√Ñ√∂‚àö√ë‚àö¬® | |
| 11. |
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» D. (+) and (-) enantiomers rotate plane polarized light in opposite directions | |
| 12. |
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» C. They react at identical rates with chiral reagents | |
| 13. |
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» D. Any pair of stereoisomers | |