KCET · Chemistry · Haloalkanes and Haloarenes
Which of the following is not true for \(\mathrm{S}_{\mathrm{N}}\) l reaction?
- A \(3^{\circ}\)-alkyl halides generally react through \(\mathrm{S}_{\mathrm{N}} 1\) reaction
- B The rate of the reaction does not depend upon the molar concentration of the nucleophile
- C \(1^{\circ}\)-alkyl halides generally react through \(\mathrm{S}_{\mathrm{N}} 1\) reaction
- D It is favoured by polar solvents
Answer & Solution
Correct Answer
(C) \(1^{\circ}\)-alkyl halides generally react through \(\mathrm{S}_{\mathrm{N}} 1\) reaction
Step-by-step Solution
Detailed explanation
In \(S_{N} 1\) reactions, rate of the reaction depends upon the concentration of the substrate only. It does not depend upon the concentration of the nucleophile.
In this type of reaction, covalent nucleophile reacts/attacks on substrate. \(3^{\circ}\) alkyl halide generally react by this mechanism, whereas \(1^{\circ}\) alkyl halide generally follow \(\mathrm{S}_{\mathrm{N}} 2\) reactions. \(\mathrm{S}_{\mathrm{N}} 1\) reactions are favoured by polar solvents.
In this type of reaction, covalent nucleophile reacts/attacks on substrate. \(3^{\circ}\) alkyl halide generally react by this mechanism, whereas \(1^{\circ}\) alkyl halide generally follow \(\mathrm{S}_{\mathrm{N}} 2\) reactions. \(\mathrm{S}_{\mathrm{N}} 1\) reactions are favoured by polar solvents.
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