MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Iodomethane reacts faster than bromomethane in SN2 reaction with OH–? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Tertiary alkyl halides show higher reactivity towards bimolecular nucleophilic substitution than secondary alkyl halides. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
The rate of the following reaction depends on the concentration of which reactant(s)/? |
| A. | tert-Butyl bromide |
| B. | Hydroxide ion |
| C. | Both tert-Butyl bromide and hydroxide ion |
| D. | None of the reactants |
| Answer» B. Hydroxide ion | |
| 4. |
Which of the following statements is correct regarding unimolecular nucleophilic substitution reactions? |
| A. | It takes place in three steps. |
| B. | The rate of the reaction depends on the concentration of all the reactants. |
| C. | The first step is the slowest and determines the rate of reaction. |
| D. | None of the steps are reversible. |
| Answer» D. None of the steps are reversible. | |
| 5. |
Which of the following will have the highest reactivity towards SN2 reaction, where R=methyl group? |
| A. | R-F |
| B. | R-Cl |
| C. | R-Br |
| D. | R-I |
| Answer» E. | |
| 6. |
A haloalkane is known to have an SN2 reaction rate 30 times faster than that of ethyl bromide. Identify the haloalkane. |
| A. | Methyl bromide |
| B. | Isopropyl bromide |
| C. | tert-Butyl bromide |
| D. | neo-Pentyl bromide |
| Answer» B. Isopropyl bromide | |
| 7. |
The reaction between chloroethane and potassium hydroxide is a _______ order reaction. |
| A. | zero |
| B. | first |
| C. | second |
| D. | third |
| Answer» D. third | |
| 8. |
Which of the following statements in incorrect regarding SN2 mechanisms? |
| A. | The rate of the reaction depends on the concentration of both reactants |
| B. | The complete mechanism takes place in a single step |
| C. | The transition state is stable |
| D. | There is inversion of configuration |
| Answer» D. There is inversion of configuration | |
| 9. |
Identify the nucleophile that gives a primary amine and hydrogen bromide on reaction with bromoethane. |
| A. | NH2 |
| B. | NH3 |
| C. | H2O |
| D. | H |
| Answer» C. H2O | |
| 10. |
Which of the following is not an ambident nucleophile? |
| A. | Hydroxide |
| B. | Thiocyanate |
| C. | Cyanide |
| D. | Nitrite |
| Answer» B. Thiocyanate | |
| 11. |
Which of the followings reagents forms an isonitrile when reacted with an alkyl halide? |
| A. | KCN |
| B. | AgCN |
| C. | KNO2 |
| D. | AgNO2 |
| Answer» C. KNO2 | |
| 12. |
What is the class of the substitution product of the reaction between LiAlH4 and an alkyl halide? |
| A. | Haloalkane |
| B. | Hydrocarbon |
| C. | Nitroalkane |
| D. | Alkyl nitrite |
| Answer» C. Nitroalkane | |
| 13. |
Identify the nucleophile in the substitution reaction between water and bromopropane. |
| A. | Br– |
| B. | H+ |
| C. | OH– |
| D. | H2O |
| Answer» E. | |
| 14. |
What will be the class of the nucleophilic substitution product when sodium hydroxide reacts with chloroethane? |
| A. | Alkane |
| B. | Alcohol |
| C. | Amine |
| D. | Ether |
| Answer» C. Amine | |
| 15. |
The reaction that takes place when an electron rich species stronger than the halide approaches the partially positive carbon atom of a haloalkane and forms a new bond with the carbon atom and in the process displacing the halogen is called a ________ reaction. |
| A. | displacement |
| B. | electrophilic substitution |
| C. | nucleophilic substitution |
| D. | elimination |
| Answer» D. elimination | |