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Questions  >>  JEEMAIN and NEET  >>  Chemistry  >>  Halogens
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Q)

Which of the following statements correctly describes E1 reaction of alkyl halide?

1.Rate=K*(Base)

2.Rate=K(Base)*RX

3.Rate=k*RX

4.Rearrangements are seen

$\begin{array}{1 1} 2\&4 \\ 3\&4 \\ 1\&2 \\ 2\&3\end{array}$

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A)
Toolbox:
  • With secondary and tertiary alkyl halides, the E1 and $S_N1$ mechanisms occur in protic solvents with weakly basic nucleophiles. The reactions occur more easily with tertiary alkyl halides if the nucleophile is not a strong base. The E1 mechanism is always in competition with $S_N1$ because both occur under the same reaction conditions.
  • $S_N1$ indicates a substitution, nucleophilic, unimolecular reaction, described by the expression rate = k [RX]
  • In an $S_N1$ reaction, the rate determining step is the loss of the leaving group to form the intermediate carbocation.
The rate of given reaction involves only the concentration of the substrate and results in the formation of carbocation which is prone to rearrangements
Hence (b) is the answer
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