MCQOPTIONS
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MCQOPTIONS
This section includes 25 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which one of the following reactants will be required to form straight chain alcohol by using Grignard reagent |
| A. | Formaldehyde |
| B. | Ketone |
| C. | Ethylene epoxide |
| D. | Both a & c |
| Answer» E. | |
| 2. |
Which one of the following molecules does not form alcohol when reacts with Grignard reagent? |
| A. | Formaldehyde |
| B. | Acetaldehyde |
| C. | Propanone |
| D. | Carbondioxide |
| Answer» E. | |
| 3. |
What will be the products when reactants are alcohol & thionyl chloride in the presence of pyridine? |
| A. | RC?+S+HC? |
| B. | RC?+SO2+HC? |
| C. | RC?+SO2+H2O |
| D. | RC?+S+H2O |
| Answer» C. RC?+SO2+H2O | |
| 4. |
Ethyl chloride with nascent hydrogen produces |
| A. | Methane |
| B. | Ethane |
| C. | Propane |
| D. | Butane |
| Answer» C. Propane | |
| 5. |
Grignard reagent is reactive due to |
| A. | The presence of halogen atom |
| B. | The presence of magnesium atom |
| C. | The polarity of C-Mg bond |
| D. | All |
| Answer» D. All | |
| 6. |
Which one is not a nucleophile? |
| A. | C2H5O- |
| B. | SCN- |
| C. | NH3 |
| D. | H3C+ |
| Answer» E. | |
| 7. |
During SN2 mechanism carbon atom changes its state of hybridization as |
| A. | Sp?sp2 |
| B. | Sp2?sp3 |
| C. | Sp3?sp |
| D. | Sp3?sp2 |
| Answer» E. | |
| 8. |
Alkyl halides are considered to be very reactive compounds towards nucleophile because |
| A. | They have an electrophilic carbon |
| B. | They have an electrophilic carbon & a good leaving group |
| C. | They have an electrophilic carbon & a bad leaving group |
| D. | They have a nucleophilic carbon & a good leaving group |
| Answer» C. They have an electrophilic carbon & a bad leaving group | |
| 9. |
The number of molecules taking part in the rate determining step is called |
| A. | Order of reaction |
| B. | Rate of reaction |
| C. | Mole of a reaction |
| D. | Extent of a reaction |
| Answer» B. Rate of reaction | |
| 10. |
SN2 reaction can be best carried out with |
| A. | Primary alkyl halide |
| B. | Secondary alkyl halide |
| C. | Tertiary alkyl halide |
| D. | All |
| Answer» B. Secondary alkyl halide | |
| 11. |
Elimination bimolecular reactions involve |
| A. | First order kinetics |
| B. | Second order kinetics |
| C. | Third order kinetics |
| D. | Zero order kinetics |
| Answer» C. Third order kinetics | |
| 12. |
The best method of preparation of alkyl halides is a reaction of alcohol with |
| A. | Zn / HCI |
| B. | SOCl2 / Pyridine |
| C. | PCI3 |
| D. | PCI5 |
| Answer» C. PCI3 | |
| 13. |
For which mechanisms the first step involved is the same? |
| A. | E1 + E2 |
| B. | E2 + SN2 |
| C. | E1 and SN1 |
| D. | SN1 and SN2 |
| Answer» D. SN1 and SN2 | |
| 14. |
The rate of E1 reaction depends upon |
| A. | The concentration of substrate |
| B. | The concentration of nucleophile |
| C. | The concentration of substrate as well as nucleophile |
| D. | Base the concentration of substrate as well as nucleophile |
| Answer» B. The concentration of nucleophile | |
| 15. |
Which one of the following species is not an electrophile? |
| A. | NH3 |
| B. | Br+ |
| C. | H+ |
| D. | BF3 |
| Answer» B. Br+ | |
| 16. |
Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone? |
| A. | Primary alcohol |
| B. | Secondary alcohol |
| C. | Tertiary alcohol |
| D. | Dihydric alcohol |
| Answer» D. Dihydric alcohol | |
| 17. |
In primary alkyl halides the halogen atom is attached to a carbon which is further attached to how many carbon atoms |
| A. | Two |
| B. | Three |
| C. | One |
| D. | Four |
| Answer» D. Four | |
| 18. |
Ethylene epoxide treated with Grignards reagent followed by acid hydrolysis yield |
| A. | Primary alcohol |
| B. | Secondary alcohol |
| C. | Tertiary alcohol |
| D. | Dihydric alcohol |
| Answer» B. Secondary alcohol | |
| 19. |
Alkyl halides undergo a type of reaction |
| A. | Nucleophilic substitution |
| B. | Nucleophilic addition |
| C. | Elimination |
| D. | Both a & c |
| Answer» E. | |
| 20. |
What is the order of kinetics in the SN1 mechanism? |
| A. | Zero |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» C. Second | |
| 21. |
Which one among the following is not a good leaving group? |
| A. | HSO4 |
| B. | C?- |
| C. | OH- |
| D. | Br- |
| Answer» D. Br- | |
| 22. |
What will be the order of reaction of a reaction whose rate can be expressed as R = K [A] [B]? |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Three |
| Answer» D. Three | |
| 23. |
When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is |
| A. | Propane |
| B. | Propanoic acid |
| C. | Propanal |
| D. | Propanol |
| Answer» C. Propanal | |
| 24. |
In elimination reactions of alkyl halide which site is more susceptible for the attack of base |
| A. | ? - carbon |
| B. | ? - carbon |
| C. | ? - hydrogen |
| D. | ? - hydrogen |
| Answer» E. | |
| 25. |
The ether used in Wurtz synthesis is |
| A. | Acidic |
| B. | Basic |
| C. | Aqueous |
| D. | Dry |
| Answer» E. | |