Answer
This arrow is going from a bond to a lone pair.
Work Step by Step
1. Identify where the tail of the arrow is:
The tail is clearly on a bond.
2. Identify where the head is going to:
The head is going to a Bromine atom.
When the electrons are going to an atom, they can:
- Be a lone pair
- Make a bond
In this case, making a bond doesn't make much sense, since the arrow is coming from a bond that the Bromine was making.
Therefore, this arrow is going from a bond to a lone pair.
