Which end of the H-F molecule will be partially positive? neither end
the fluorine end
both ends
the hydrogen end

the hydrogen end

Explanation:

In H - F molecules there is a charge separation. Hydrogen has partial positive charge on them and Fluorine has a partial negative charge on it.

The bonds between H - F molecule is a covalent bond. In this bond, both atoms share their electrons to attain a stable configuration But the electrons are not shared equally. Fluorine is more electronegative compared to the hydrogen. Fluorine therefore, attracts the shared electrons more closely to itself. This makes fluorine more negative and hydrogen positive.

The answer is 4 i don't know if its right let me see.