(a) (i) Write the major product(s) in the following reactions : (1) $\text{C}_6\text{H}_5\text{CH}_2\text{CH}_3 \xrightarrow[ ext{b) H}^+]{ ext{a) KMnO}_4, \text{KOH}} ?$ (2) $\text{C}_6\text{H}_5\text{CHO} + \text{CH}_3 - \text{C} - \text{CH}_3 \xrightarrow{\text{dil NaOH}} ? \text{ (where } \text{C} \text{ is double bonded to } \text{O)} $ (3) $\text{C}_6\text{H}_5\text{COOH} \xrightarrow{\text{Br}_2 / \text{FeBr}_3} ?$