Hydrogen fluoride, HF, is a liquid at 15°C. All other hydrogen halides (represented by HX, where X is any other halogen) are gases at the same temperature. Why?
(A)Fluorine has a very high electronegativity; therefore the H-F bond is stronger than any other H-X bond. (B)HF is smaller than any other H-X molecule; therefore it exhibits stronger London dispersion forces. (C)The dipoles in a HF molecule exhibit a particularly strong attraction force to the dipoles in other HF molecules. (D)The H-F bond is the most ionic in character compared to all other hydrogen halides.
C