Answer
$HCl$ and $CH_3COOH$ can't form a buffer solution.
Work Step by Step
1. For a buffer solution, we need:
- 1 Weak acid: $CH_3COOH$
- 1 Weak base: Missing.
- Since this pair doesn't have a weak base, it can't neutralize acids that are added to the solution, therefore, they can't form a buffer.