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The rate of dehydrohalogenation of which one among the following is less ?
Options:
- A $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}$
- B $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Cl}$
- C $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2$
- D
Solution:
2416 Upvotes
Verified Answer
The correct answer is:
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Cl}$
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.
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