Question:
Which one of the following factors proceeds more rapidly, unimolecular nucleophilic substitution reaction?
Which one of the following factors proceeds more rapidly, unimolecular nucleophilic substitution reaction?
Show Hint
SN1 goes through a carbocation, which polar protic solvents stabilise.
Updated On: Oct 1, 2026
- Aprotic solvent
- Stronger nucleophile
- Weaker nucleophile
- Polar protic solvent
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Recall the SN1 mechanism
SN1 is a two-step reaction. The slow step is ionisation to a carbocation, so the rate depends only on the substrate.
Step 2: Which factor helps
A polar protic solvent solvates the carbocation and the leaving group, so it speeds up the slow step. Nucleophile strength does not change the rate. Aprotic solvents favour SN2. Option (D).
Final Answer:
A polar protic solvent speeds up SN1, option (D). \[ \boxed{\text{(D)}} \]
SN1 is a two-step reaction. The slow step is ionisation to a carbocation, so the rate depends only on the substrate.
Step 2: Which factor helps
A polar protic solvent solvates the carbocation and the leaving group, so it speeds up the slow step. Nucleophile strength does not change the rate. Aprotic solvents favour SN2. Option (D).
Final Answer:
A polar protic solvent speeds up SN1, option (D). \[ \boxed{\text{(D)}} \]
Was this answer helpful?
0
0
Top MHT CET Chemistry Questions
- The temperature of $32^{\circ}C$ is equivalent to
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
- If a metal crystallises in bcc structure with edge length of unit cell $4.29 \times 10^{-8}\, cm$ the radius of metal atom is
- Which of the following oxides can act both as an oxidising agent as well as reducing agent ?
- "The mass and energy both are conserved in an isolated system", is the statement of
View More Questions
Top MHT CET Haloalkanes and Haloarenes Questions
- The solubility (in ) of in a solution will be:
- Which of the following is not a thermodynamic coordinate?
- What is the name of the above reaction?
- In the presence of a catalyst, the heat evolved or absorbed during the reaction _______.
Identify allylic halide and vinylic halide.
View More Questions
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions