Q17 / 160 · AP EAMCET 2018 (23 Apr Shift 2) · Chemistry

The rate of dehydrohalogenation of which one among the following is less ?

  • A
    $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}$
  • Correct answer
    B
    $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Cl}$
  • C
    $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2$
  • D
    Figure

Solution

Dehydrohalogenation reaction order is alkyl halide relative reactivity order is $3^{\circ}>2^{\circ}>1^{\circ}$ Alkyl halide reactivity order is $\mathrm{I}>\mathrm{Br}>\mathrm{Cl}>\mathrm{F}$ (in $\beta$ elimination of $\mathrm{F}$ is rarely used). When heated with strong base, alkyl halides typically undergo a 1, 2-elimination reaction to generate alkenes.

Hence, the correct answer is option: 'B'.

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