Question

Draw the structures of major monohalo products in each of the following reactions:

Hint:

Markovnikov's rule states that in the electrophilic addition of HX to an alkene, the hydrogen atom adds to the carbon with more hydrogen atoms.

Answer 1

(i) Reaction with HBr: The addition of HBr to styrene (C$_6$H$_5$CH=CH$_2$) follows Markovnikov’s rule, leading to the formation of 1-bromoethylbenzene as the major product.

(ii) Bromination in UV light: In the presence of UV light, free radical substitution occurs, resulting in the formation of bromocyclohexane as the major product.