Select the mechanism(s) where the concentration of the nucleophile or base has no effect on the reaction rate. E1 E2 SN2 SN1
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Which mechanism SN1, SN2, E1, E2? Strong bulky bases (primary and secondary) E2 favored over SN2. Small strong bases/nucleophiles (primary and secondary) SN2 and E2. Small strong bases/nucleophiles (tertiary) - E2. Weak bulky bases – E1 over SN1. Weak bases/nucleophiles (secondary and tertiary alkyl halides) – E1 and SN1. Weak bases/nucleophiles (primary alkyl halides) – E1 Choose which mechanism(s)
Madhur L.
(a) When 1 -chloro-2-pentene is reacted with concentrated solution of sodium ethoxide, the rate of reaction depends on the concentration of both allylhalide and ethoxide ion. The product of reaction is exclusively $$ \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{2} \mathrm{OC}_{2} \mathrm{H}_{5} $$ (b) In dilute solution of sodium ethoxide, the reaction rate is dependent only on the concentration of allylhalide. (c) In the presence of traces of water, 1 -chloro-2-pentene is slowly converted to a mixture of 1 -chloro-2-pentene and 3-chloro-1-pentene In case (a) the mechanism exclusively followed by reaction is (a) $\mathrm{S}_{\mathrm{N}} 1$ (b) $\mathrm{S}_{\mathrm{N}} 2$ (c) $\mathrm{E}_{1}$ (d) $\mathrm{E}_{2}$
Alkyl Halides, Alcohols and Ethers
Level II
(a) When 1 -chloro-2-pentene is reacted with concentrated solution of sodium ethoxide, the rate of reaction depends on the concentration of both allylhalide and ethoxide ion. The product of reaction is exclusively $$ \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{2} \mathrm{OC}_{2} \mathrm{H}_{5} $$ (b) In dilute solution of sodium ethoxide, the reaction rate is dependent only on the concentration of allylhalide. (c) In the presence of traces of water, 1 -chloro-2-pentene is slowly converted to a mixture of 1 -chloro-2-pentene and 3-chloro-1-pentene In case (a) the mechanism exclusively followed by reaction is (a) $\mathrm{S}_{\mathrm{N}} 1$ (b) $\mathrm{S}_{\mathrm{N}} 2$ (c) $\mathrm{E}$ (d) $\mathrm{E}_{2}$
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