Predict the major product(s) of the following reactions and explain their formation.
`H_(3)C-CH=CH_(2) underset("HBr")overset(Ph-CO-O_(2)H)to`
`H_(3)C-CH=CH_(2) overset("HBr")to`

Explanation

To predict the major products of the given reactions, we need to analyze each reaction step by step.

### Reaction 1: `H3C-CH=CH2` with `HBr` in the presence of `Ph-CO-O2H` (peroxybenzoic acid)

1. **Identify the Reactants**: The reactant is propene (`H3C-CH=CH2`), and it reacts with HBr in the presence of peroxybenzoic acid.

2. **Understand the Mechanism**: In the presence of peroxides, the addition of HBr follows the Anti-Markovnikov rule. This means that the bromine (Br) will add to the carbon with the greater number of hydrogen atoms, while the hydrogen (H) will add to the carbon with fewer hydrogen atoms.

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