Question

$1-Butene+HBr\underset{h\nu }{\overset{H_2{O}_2}{\to }}1-BromoButane$

The above reaction follows:

• A. Markownikoff's rule
• B. Saytzeff's rule
• C. Anti Markownikoff's rule
• D. Hoffmann's rule

Answer 1

The correct option is C Anti Markownikoff's rule

The addition of HBr to 1-butene in presence of light and hydrogen peroxide to obtain 1-bromobutane is according to Anti Markownikoff's rule. A molecule of HBr is added to C=C double bond. Br is added to terminal less substituted C atom.