MCQ
Dehydrohalogenation of an alkyl halide is a/an :
- ANucleophilic substitution reaction.
- ✓Elimination reaction
- CBoth nucleophilic substitution and elimination reaction.
- DRearrangement
✓
Answer
Correct option: B.
Elimination reaction
Dehydrohalogenation is an elimination reaction. In this reaction, hydrogen and halogen atoms get eliminated from alkyl halide to give an alkene or alkynes.
For example : When chloropropane is heated with alcoholic $\text{KOH}$ gives Propene.
Reaction : $\mathrm{CH}_3 \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Cl}+\mathrm{KOH} \xrightarrow{\text { heat }} \mathrm{CH}_3 \mathrm{CH}=\mathrm{CH}_2+\mathrm{KCl}+\mathrm{H}_2 \mathrm{O}$.
For example : When chloropropane is heated with alcoholic $\text{KOH}$ gives Propene.
Reaction : $\mathrm{CH}_3 \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Cl}+\mathrm{KOH} \xrightarrow{\text { heat }} \mathrm{CH}_3 \mathrm{CH}=\mathrm{CH}_2+\mathrm{KCl}+\mathrm{H}_2 \mathrm{O}$.
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