The reaction of hydrogen bromide with propene in absence of peroxide is an example of a/an

The reaction of hydrogen bromide with propene in the absence of peroxide is an example of an electrophilic addition reaction.

Here's the step-by-step process:

1. The double bond in the propene molecule is broken, creating a space for the hydrogen bromide molecule to attach.

2. The hydrogen atom in the hydrogen bromide molecule is attracted to the carbon atoms in the propene molecule because of their partial negative charge. This is the electrophilic part of the reaction.

3. The hydrogen atom attaches to one of the carbon atoms, and the bromine atom attaches to the other. This forms a new molecule with a single bond between the carbon atoms and the hydrogen and bromine atoms attached.

4. The final product is 2-bromopropane.

This type of reaction is typical of alkenes, and it's called electrophilic addition because an electrophile (in this case, hydrogen bromide) is added to the molecule.