For example like HCl, why isn't it a hydrogen bond?
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Hydrogen bonding is defined as an electrostatic attraction between a hydrogen atom bearing a partial positive charge in a molecule and an electronegative element of another molecule. The partial positive charge is the result of a dipole, caused by an electronegative element, such as F, O, or N. The other electronegative element to which the partially positive hydrogen is attracted to is also usually F, O, or N.
Here's the IUPAC definition; note that it does not exclude the possibility of hydrogen bonding in molecules such as HCl:
A form of association between an electronegative atom and a hydrogen atom attached to a second, relatively electronegative atom. It is best considered as an electrostatic interaction, heightened by the small size of hydrogen, which permits proximity of the interacting dipoles or charges. Both electronegative atoms are usually (but not necessarily) from the first row of the Periodic Table, i.e. N, O or F. Hydrogen bonds may be inter-molecular or intramolecular.
answered Jun 14, 2014 at 20:56
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$\begingroup$ Can you answer me one last question....why is hydrogen bonding stronger than permanent dipole and not permanent dipole stronger than h-bond.....tell me all reasons...need it :) $\endgroup$– VonCommented Jun 14, 2014 at 20:57
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$\begingroup$ No Sir my homework question was list 3 intermolecular attractive forces and list them in order of increasing strenght? that ive answered it...but teacher might ask question beside that to see some knowledge.. $\endgroup$– VonCommented Jun 14, 2014 at 21:01
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$\begingroup$ Chemistry Speech in class 60s to answer the question and the remaining if time left then he would ask some question of what you know of this question so im trying to sum it up. $\endgroup$– VonCommented Jun 14, 2014 at 21:02
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$\begingroup$ Try giving some reasons in your OP and I'll see if they're right. $\endgroup$ Commented Jun 14, 2014 at 21:04