Strongest hydrogen bond is present ina)F-H---Fb)o-h---h

1.	Strongest hydrogen bond is present ina)F-H---Fb)o-h---h
Answer» Hydrogen bonding is a special type of dipole-dipole attraction between molecules, not a covalent bond to a hydrogen atom. It results from the ATTRACTIVE force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom. Hydrogen bond strengths range from 4 kJ to 50 kJ per mole of hydrogen bonds. In molecules CONTAINING N-H, O-H or F-H bonds, the large difference in electronegativity between the H atom and the N, O or F atom leads to a highly polar covalent bond (i.e., a bond dipole). The electronegativities are listed below. elementelectronegativity valueH2.1N3.0O3.5F4.1Because of the difference in electronegativity, the H atom bears a large partial POSITIVE charge and the N, O or F atom bears a large partial negative charge. A H atom in one molecule is electrostatically attracted to the N, O, or F atom in another molecule.

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