I Indicate whether the following statements are true or false for nucleophilic s
ID: 516041 • Letter: I
Question
I Indicate whether the following statements are true or false for nucleophilic substitutions occurring by the S_N 1 mechanism? (a) Tertiary alkyl halides react faster than the secondary. (b) The absolute configuration of the product is opposite to that of the reactant when an optically active substrate is used. (c) The rate of reaction depends markedly on the nucleophilicity of the attacking nucleophile. (d) The rate of reaction depends on the nature of the leaving group. (e) The rate of reaction is proportional to the concentration of the attacking nucleophile.Explanation / Answer
a) True (SN1 mechanism invovles the formation of a carbocation. As the tertiary carbocation is more stable than secondary carbocation, tertiary alkyl halides gives faster SN11 mechanism.)
b) False (The product formed will be a racemic mixture in SN1 mechanism.)
c) False. (The rate of reaction depends only on the ocncentration of alkyl halide in SN1 mechanism.)
d) True. As the leaving capacity of leaving group increases, the rate of reaction increases.
e) c) False. (The rate of reaction depends only on the ocncentration of alkyl halide in SN1 mechanism.)
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