1 III \(>\) I \(>\) IV \(>\) II
2 III \(>\) I \(>\) II \(>\) IV
3 I \(>\) III \(>\) IV \(>\) II
4 I \(>\) III \(>\) II \(>\) IV
Explanation:
Alcohols on reaction with \({\text{HBr}}\) forms carbo-cation as an intermediate .Hence, Reactivity of alcohol depends on the satbility of carbo-cation.
\({\text{EDG}}\,\,\,\alpha \,\,{\text{Stability}}\,\,{\text{of}}\,\,{\text{Carbocation}}\)
\({\text{EWG}}\,\,\,\alpha \,\,\,\frac{{\text{1}}}{{{\text{Stability}}\,\,{\text{of}}\,\,{\text{Carbocation}}}}\)