Why are hydrogen bonds considered a special class of dipole-dipole interactions?

Question

Why are hydrogen bonds considered a special class of dipole-dipole interactions? They are observed with all molecules that contain hydrogen. These interactions only occur if hydrogen is bonded to nitrogen, oxygen, and fluorine. These interactions only occur with organic molecules. These interactions are with polar molecules but are stronger than dipole-dipole interactions. These interactions are between polar molecules but are weaker than normal dipole-dipole interactions. They are observed with all molecules that contain only hydrogen and fluorine. These interactions account for the higher melting and boiling points observed for certain molecules such as water.

Explanation / Answer

Hydrogen bonds are special class of dipole-dipole interactions mainly due to their special electron relation

the Hydrogen is positively charge, mostly, and the O, N, F are negativley charged, so + / - dipole is formed

A) FALSE, they are present only in m,oleucles with O,N,F atoms + Hydrogen

B) TRUE

C) False, also inorganic material, such as HCl and H2O

D) This is true, dipople + hydrogne bonding are always stronger

E) False, they are stronger, many times than lenty of dipole dipole interactions

F) FALSE, they must be bonded directly, for instance CH2F2 will not form, since H and F are bonded to C

G) True, H-bonding interacts storngly, they increase energy requirements

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