MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The formula of enantiomeric excess is ____________ |
| A. | [(d+l)/(d-l)]*100 |
| B. | [(d)/(d+l)]*100 |
| C. | [(d-l)/(d)]*100 |
| D. | [(d-l)/(d+l)]*100 |
| Answer» D. [(d-l)/(d+l)]*100 | |
| 2. |
Optical purity is defined as the ____________ |
| A. | Ratio of rotation of pure enantiomer to rotation of mixture |
| B. | Ratio of rotation of mixture to rotation of pure enantiomer |
| C. | Product of rotation of mixture and rotation of pure enantiomer |
| D. | Sum of rotation of mixture and rotation of pure enantiomer |
| Answer» C. Product of rotation of mixture and rotation of pure enantiomer | |
| 3. |
Under SN2 conditions, on reaction with NaOH, (S)-2-bromo octane gives (R)-2-octanol. This is an example of ____________ |
| A. | Dynamicselective |
| B. | Stereoselective |
| C. | Regioselective |
| D. | Stereospecific |
| Answer» E. | |
| 4. |
Under SN2 conditions, on reaction with NaOH, (R)-2-bromo octane gives ____________ |
| A. | (S)-2-octanol |
| B. | (R)-2-octanol |
| C. | Trans-2-butene |
| D. | Cis-2-butene |
| Answer» B. (R)-2-octanol | |
| 5. |
R C = C R reacts in the presence of lindlar catalyst to give a syn product. This is an example of ____________ |
| A. | Dynamicselective |
| B. | Stereoselective |
| C. | Regioselective |
| D. | Stereospecific |
| Answer» C. Regioselective | |
| 6. |
Reaction of ( ) 2,3- dibromobutane is slower than meso in which the two methyl groups are ____________ |
| A. | Skew |
| B. | Anti |
| C. | Gauche |
| D. | Partially eclipsed |
| Answer» E. | |
| 7. |
The reaction in which stereochemically different molecules react differently is called ____________ |
| A. | Dynamicselective |
| B. | Stereoselective |
| C. | Regioselective |
| D. | Stereospecific |
| Answer» E. | |
| 8. |
The reaction that yields predominantly one enantiomer of a possible pair is called ____________ |
| A. | Dynamicselective |
| B. | Stereoselective |
| C. | Regioselective |
| D. | Stereospecific |
| Answer» C. Regioselective | |
| 9. |
The reaction which gives exclusively one of several possible isomeric products is called ____________ |
| A. | Dynamicselective |
| B. | Stereoselective |
| C. | Regioselective |
| D. | Stereospecific |
| Answer» D. Stereospecific | |