Given information
Binary compounds can be defined as chemical compounds which are mainly composed of two types of elements.
Step-by-step explanation
In a periodic table, across a period electronegativity increases as the size of the atom decreases. In the given binary compounds, contain halogen atoms with general valence shell electronic configuration of . It has only one electron less in order to complete its octet. Therefore, its electronegativity is higher than the other binary compounds. Hence, it is the most acidic in the given binary compounds. Whereas sodium belongs to the first group and is electropositive in nature.
The acidic nature of binary compounds can be determined on the basis of their molecular structure, bond length, and bond strength. In the given binary compounds, must be the least acidic compound as is a metallic element and it is more electropositive than so it must be basic in nature.