Explanation:

When silver nitrate solution is added to a solution containing certain ions, it can form a precipitate. A precipitate is a solid that forms when two solutions react with each other. In this case, the precipitate that forms is silver bromide (AgBr).

Precipitation Reactions:
- Ethyl bromide (C2H5Br):
Ethyl bromide is an organic compound that does not contain any ions. Therefore, it does not react with silver nitrate solution and does not form a precipitate.

- Sodium bromide (NaBr):
Sodium bromide is an ionic compound that dissociates into sodium ions (Na+) and bromide ions (Br-) in solution. When silver nitrate solution is added, the silver ions (Ag+) react with the bromide ions to form silver bromide (AgBr) precipitate.

- Calcium chloride (CaCl2):
Calcium chloride is also an ionic compound that dissociates into calcium ions (Ca2+) and chloride ions (Cl-) in solution. When silver nitrate solution is added, the silver ions (Ag+) react with the chloride ions to form silver chloride (AgCl) precipitate.

- Sodium chloride (NaCl):
Sodium chloride is an ionic compound that dissociates into sodium ions (Na+) and chloride ions (Cl-) in solution. When silver nitrate solution is added, the silver ions (Ag+) react with the chloride ions to form silver chloride (AgCl) precipitate.

Conclusion:
Based on the explanation above, the substance that does not give a precipitate with silver nitrate solution is ethyl bromide (C2H5Br). This is because it does not contain any ions that can react with the silver ions in the solution.

In case of NaCl, CaCl2, NaBr - Na+ is more electropositive than Ag+, thus it form precipitate but in case of CH3CH2Br it do not have that much, thus it do not form precipitate with Ag(NO3)