Class 12 Exam > Class 12 Questions > Consider the following SN2 reaction,1-bromobu...
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Consider the following SN2 reaction,
1-bromobutane + NaCN(aq) → pentanenitrile +NaBr
Q.
Which of the following solvents) when replaces water in the above reaction, increases the rate?
- a)Acetone
- b)Dimethyl sulphoxide
- c)N, N-dimethyl formamide
- d)Tetrahydrofurane
Correct answer is option 'A,B,C,D'. Can you explain this answer?
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Verified Answer
Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → p...
All the mentioned solvents are polar and'aprotic, hence increases rate of SN2 reaction.
Most Upvoted Answer
Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → p...
Explanation:
In an SN2 reaction, a nucleophile attacks the carbon atom with the leaving group, resulting in the substitution of the leaving group by the nucleophile. The rate of an SN2 reaction is influenced by the nature of the nucleophile, the leaving group, the substrate, and the solvent.
A polar aprotic solvent is generally preferred for SN2 reactions because it can solvate the nucleophile without interfering with its reactivity. Water, being a polar protic solvent, can solvate the nucleophile and hinder its attack on the substrate. Therefore, replacing water with a polar aprotic solvent can increase the rate of the reaction.
Let's evaluate each solvent option and its impact on the rate of the SN2 reaction:
1) Acetone:
- Acetone is a polar aprotic solvent.
- It can solvate the nucleophile without hindering its reactivity.
- Therefore, replacing water with acetone can increase the rate of the reaction.
2) Dimethyl sulfoxide (DMSO):
- DMSO is a polar aprotic solvent.
- It can solvate the nucleophile without hindering its reactivity.
- Therefore, replacing water with DMSO can increase the rate of the reaction.
3) N, N-dimethyl formamide (DMF):
- DMF is a polar aprotic solvent.
- It can solvate the nucleophile without hindering its reactivity.
- Therefore, replacing water with DMF can increase the rate of the reaction.
4) Tetrahydrofuran (THF):
- THF is a polar aprotic solvent.
- It can solvate the nucleophile without hindering its reactivity.
- Therefore, replacing water with THF can increase the rate of the reaction.
In summary, all the mentioned solvents (acetone, DMSO, DMF, and THF) are polar aprotic solvents, which can solvate the nucleophile without interfering with its reactivity. Thus, replacing water with any of these solvents will increase the rate of the SN2 reaction.
In an SN2 reaction, a nucleophile attacks the carbon atom with the leaving group, resulting in the substitution of the leaving group by the nucleophile. The rate of an SN2 reaction is influenced by the nature of the nucleophile, the leaving group, the substrate, and the solvent.
A polar aprotic solvent is generally preferred for SN2 reactions because it can solvate the nucleophile without interfering with its reactivity. Water, being a polar protic solvent, can solvate the nucleophile and hinder its attack on the substrate. Therefore, replacing water with a polar aprotic solvent can increase the rate of the reaction.
Let's evaluate each solvent option and its impact on the rate of the SN2 reaction:
1) Acetone:
- Acetone is a polar aprotic solvent.
- It can solvate the nucleophile without hindering its reactivity.
- Therefore, replacing water with acetone can increase the rate of the reaction.
2) Dimethyl sulfoxide (DMSO):
- DMSO is a polar aprotic solvent.
- It can solvate the nucleophile without hindering its reactivity.
- Therefore, replacing water with DMSO can increase the rate of the reaction.
3) N, N-dimethyl formamide (DMF):
- DMF is a polar aprotic solvent.
- It can solvate the nucleophile without hindering its reactivity.
- Therefore, replacing water with DMF can increase the rate of the reaction.
4) Tetrahydrofuran (THF):
- THF is a polar aprotic solvent.
- It can solvate the nucleophile without hindering its reactivity.
- Therefore, replacing water with THF can increase the rate of the reaction.
In summary, all the mentioned solvents (acetone, DMSO, DMF, and THF) are polar aprotic solvents, which can solvate the nucleophile without interfering with its reactivity. Thus, replacing water with any of these solvents will increase the rate of the SN2 reaction.
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Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → pentanenitrile +NaBrQ. Which of the following solvents) when replaces water in the above reaction, increases the rate?a)Acetoneb)Dimethyl sulphoxidec)N, N-dimethyl formamided)TetrahydrofuraneCorrect answer is option 'A,B,C,D'. Can you explain this answer?
Question Description
Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → pentanenitrile +NaBrQ. Which of the following solvents) when replaces water in the above reaction, increases the rate?a)Acetoneb)Dimethyl sulphoxidec)N, N-dimethyl formamided)TetrahydrofuraneCorrect answer is option 'A,B,C,D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → pentanenitrile +NaBrQ. Which of the following solvents) when replaces water in the above reaction, increases the rate?a)Acetoneb)Dimethyl sulphoxidec)N, N-dimethyl formamided)TetrahydrofuraneCorrect answer is option 'A,B,C,D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → pentanenitrile +NaBrQ. Which of the following solvents) when replaces water in the above reaction, increases the rate?a)Acetoneb)Dimethyl sulphoxidec)N, N-dimethyl formamided)TetrahydrofuraneCorrect answer is option 'A,B,C,D'. Can you explain this answer?.
Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → pentanenitrile +NaBrQ. Which of the following solvents) when replaces water in the above reaction, increases the rate?a)Acetoneb)Dimethyl sulphoxidec)N, N-dimethyl formamided)TetrahydrofuraneCorrect answer is option 'A,B,C,D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → pentanenitrile +NaBrQ. Which of the following solvents) when replaces water in the above reaction, increases the rate?a)Acetoneb)Dimethyl sulphoxidec)N, N-dimethyl formamided)TetrahydrofuraneCorrect answer is option 'A,B,C,D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → pentanenitrile +NaBrQ. Which of the following solvents) when replaces water in the above reaction, increases the rate?a)Acetoneb)Dimethyl sulphoxidec)N, N-dimethyl formamided)TetrahydrofuraneCorrect answer is option 'A,B,C,D'. Can you explain this answer?.
Solutions for Consider the following SN2 reaction,1-bromobutane + NaCN(aq) → pentanenitrile +NaBrQ. Which of the following solvents) when replaces water in the above reaction, increases the rate?a)Acetoneb)Dimethyl sulphoxidec)N, N-dimethyl formamided)TetrahydrofuraneCorrect answer is option 'A,B,C,D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
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