The reaction of propane with bromine in presence of UV light predominantly forms

Step-by-step solution

The reaction between propane and bromine under UV light is a free radical substitution mechanism. The key selectivity arises during hydrogen abstraction, where bromine radicals target propane's six primary and two secondary hydrogens. The secondary radical, CH₃ CH CH₃ , is more stable than the primary radical due to hyperconjugation and inductive effects. Bromination is highly selective, favoring formation of the more stable radical with lower activation energy. Thus, 2-bromopropane forms predominantly. CH₃ CH₂ CH₃