The question refers to a specific mono-bromination reaction, but the uploaded prompt does not include the structure of the substrate/reaction scheme. Without the starting molecule, the number of possible chiral monobrominated products cannot be determined uniquely.

To solve such a question, we would need to:

1. Identify all non-equivalent H atoms that can be replaced by Br.
2. Draw each distinct monobrominated constitutional isomer.
3. Check each product for chirality:
   • presence of a stereogenic center,
   • absence of internal symmetry,
   • possible formation of enantiomeric pairs counted as one product or two depending on the exam convention.
4. Count the number of products that are chiral.

However, since the actual reactant structure is missing, this counting cannot be done rigorously.

Because of that, I cannot independently verify whether the stored answer $5$ is correct from the information provided.

If you upload or type the reaction structure, I can compute the exact number step-by-step.