Question

Write the name of the major organic product formed in the reaction of 1-pentene with hydrogen bromide in the presence of peroxides.

• A. 1-bromopentane
• B. 2-bromopentane
• C. 3-bromopentane
• D. None of these

Answer 1

The correct option is A 1-bromopentane

1-pentene reacts with hydrogen bromide in presence of peroxide to form 1-bromopentane. This is an example of electrophilic addition reaction. The addition occurs according to anti-Markownikoff's rule.

Anti-Markonikoff's rule says that the negative part will be added to the less substituted carbon.

$C{H}_2=CHC{H}_{2}C{H}_{2}C{H}_3+H^{+}B{r}^{-}\stackrel{peroxide}{\to }C{H}_{2}BrC{H}_2-C{H}_{2}C{H}_{2}C{H}_3$

The product formed is 1-bromopentane. Hence, the correct option is A.