The rate law for the following reaction is CH_3 CH_2 CH_2 Cl + NaCN rightarrow^D
ID: 526745 • Letter: T
Question
The rate law for the following reaction is CH_3 CH_2 CH_2 Cl + NaCN rightarrow^DMSO A) rate = k [Ch_3 Ch_2 CH_2 Cl]. B) rate = k [CH_3 CH_2 CH_2 Cl] {NaCN]. C) rate = k [CH_3 CH_2 CH_2 Cl] [NaCN]^2. rate k [NaCN]. In which of the solvent below would the reaction shown take place at the fastest rate? CH_3 CH_2 CH_2 Ch_2 Br + NaCN rightarrow CH_3 CH_2 CH_2 CH_2 CN + NaBr A) ethanol B) acetic acid C) dimethyl sulfoxide D) water What is the rate limiting step in the following reaction? (CH_3)_3 CCl + H_2O rightarrow (CH_3)_3 COH + HCl A) (CH_3)_3 CCl rightarrow (CH_3)_3 C^+ + Cl B) (CH_3)_3 C^+ + H_2O rightarrow (CH_3)_3C-OH_2^+ C) (Ch_3)_3 C-OH-2^+ + H_2O rightarrow (CH_3)_3 C-OH_2^+ + H_2O rightarrow (CH_3)_3 COH + H_3O^+ D) H_3O^+ + Cl rightarrow HCL + H_2O Which alcohol below would undergo acid- catalyzed dehydration most readily?Explanation / Answer
19) option B is correct
Explanation: reaction of primary alkyl halide with a strong nucleophile, NaCN is SN2 mechanism and the rate of reaction invovles concentration of both alkyl halide and nucleopphile.
20) option C is correct
Explanation: SN2 reaction is favourable in aprotic solvents.
21) option A is correct
Explanation: formation of carbocation is a rate limiting step in SN1 reactions.
22) option D is correct
Explanation: dehydration of alcohol involves Sn1 mechanism which invovles formation of carbocation as an intermediate. so the structure which leads to the formation of more stable carbocation is most reactive in acid catalyzed dehydration.
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