Question 5 A substitution reaction is carried out on 2-iodobutane with sodium ha

Question

Question 5 A substitution reaction is carried out on 2-iodobutane with sodium halide in alcohol solvent at 25°C, as tollows: CH3CH2-CHI-CH3 + NaX (alcohol)-......> CH3CH2-CH(X)-CH3 + Nal (X= Br or Cl) Based on the following observations, what is the most ikely mechanism of this reaction? 1. The reaction rate is the same for NaCI and NaBr. 2. 2-methyl-2-iodobutane reacts faster with NaX under the same solventtemperature conditions (mechanism is same as the 2-iodobutane reaction). Not yet Marked out of 1.00 Flag question Select one: A. SN1 B. A two-step substitution mechanism in which the 2nd step is slow and rate-determining. C. SN2 D. A two step mechanism in which X bonds to C (bearing l) in step 1, followed by loss of l in step 2. Question 6 Which of the following nucleophiles is most reactive in SN2 reactions? Not yet Marked out of 1.00 Flag question Select one: C. All the nucleophiles are equally reactive. Question 7 which o the following substrates is most reactive in a nucleop ic substitution reaction with OH / H2O reaction shown below)? Given: observed order of base strength: 1

Explanation / Answer

5. alcohol is the solvent in this reaction.

alcohol is the protic solvent. so here occurs SN1 reaction.

option A is the answer.

6. negative charged compound is more nucleophilic than non charged compound.

so option B. II is the answer.

7. this is SN1 reaction.

so step-1 involves formation of carbocation by breaking the C-X bond. C-I bond is lower energy and easily form carbocation.

so option C. III is the answer.

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