Saplong 15

[Ayesha Aslam-Mir 3C]

On Sapling Question 15, why is HF the only compound listed (hydrogen halide) thta remains covalently bonded in water of HF, HBr, HCl, and HI?

[Rohit Srinivas 2D]

I believe the question is asking which one of the molecules has hydrogen bonding in water. (these are the atoms with H bound to F, O, or N) HF is the only molecule that meets this criteria

[Sera Aintablian 2E]

HF is the only covalent bond within that list capable of Hydrogen bonding. Remember, the three elements that can bond with Hydrogen are Nitrogen, Oxygen, and Fluorine.

[Fernanda Olvera 3D]

I agree with Sera, just remember F, O, N.

[Ven Chavez 2K]

For the question it is only necessary to acknowledge that HF is the only one that can form hydrogen bonds since hydrogen bonds can only be made between N, O, and F. But I believe it might be that HF has the most polar covalent properties among the hydrogen halides. This is because electronegativity decreases as you go down a group. Therefore the electrons would attract closer to F than any other in the group causing more polarity.

[AntonioZarich2E]

It has to be HF because F is the only element out of the options that can bond with hydrogen.

[sabrina ghalambor 2J]

everyone has stated why its HF above, but I think it's also important to remember that the bond lengths between H and other molecules in group 17 increase as you go down!