Identify major product $\mathrm{A}$ in following reaction. 3-Bromo-2-methylpentane $\stackrel{\text { ak }…
Identify major product $\mathrm{A}$ in following reaction.
3-Bromo-2-methylpentane $\stackrel{\text { ak } \mathrm{KoH}}{\longrightarrow} \mathrm{A}$
2-Methylpentan-3-ol
2-Methylpent-2-ene
4-Methylpent-3-ene
4-Methylpentan-3-ol
Solution
When alkyl halide having at least one $\beta$-hydrogen is boiled with alcoholic solution of potassium hydroxide, it undergoes elimination of hydrogen atom from $\beta$-carbon and halogen atom from $\alpha$-carbon resulting in the formation of an alkene. This reaction is known as dehydrohalogenation reaction or $\beta$-elimination. The preferred product is that alkene which has greater number of alkyl groups attached to doubly bonded carbon atoms according to Saytzeff rule.
