Question

For each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules of the compound and molecules of water. compound hydrogen-bonding force name formula or Lewis structure Between molecules of the compound? Between molecules of the compound and molecules of water? yes yes hydrogen bromide H Br no no :0: formic acid H-0-0- H ono O o o hydrogen fluoride HF yes no o x 6 ?

Answer 1

Hydrogen bonding is an electrostatic attraction between a hydrogen atom and an electronegative atom, such as, oxygen, nitrogen or fluorine. When hydrogen bonding occurs between two separate molecules, it is called intermolecular hydrogen bonding. 1) HBr does not show neither intramolecular H-bonding nor it forms H-bonds with water as electronegativity of bromine is not high enough to from strong H-bonds. Therefore, correct answer is. Between molecules of compound: NO Between molecules of compound and water: NO 2) Formic acid shows intramolecular H-bonding and intermolecular H-bonding shown as follows: H H / H —H. : 0 : Hydrogen bond between molecules of formic acid Hydrogen bond between formic acid and water Therefore, correct answer is, Between molecules of compound: YES Between molecules of compound and water: YES HF has strong electronegative fluoride atom and it shows both intramolecular as well as intermolecular hydrogen bonding. H-F ITH H—F : :.H : O H - F: Hydrogen bond between molecules of HF Hydrogen bond between molecules of HF and water

Therefore, correct answer is, Between molecules of compound: YES Between molecules of compound and water: YES