Question

Isobutene $\underset{\text{ peroxide }}{\overset{+\text{ HBr }}{\to }}$ product is :

• A. tertiary butyl bromide
• B. isobutyl bromide
• C. tertiary butyl alcohol
• D. isobutyl alcohol

Answer 1

Answer: (B)

Anti-Markownikoff rule applies to addition reactions in presence of HBr. It states that negative part of reagent adds to the carbon atom having more number of hydrogen atoms.
We will apply this rule to find the product.
$\underset{\text{Isobutene}}{C{H}_3-\underset{\stackrel{|}{C}{H}_3}{C}=C{H}_2}+HBr\stackrel{\text{ Peroxide }}{\to }\underset{\text{Isobutyl bromode}}{C{H}_3-\underset{\stackrel{|}{C}{H}_3}{\mathrm{CH}}-C{H}_{2}Br}$