So hydrogen bonding is an intermolecular forces. I'm assuming that the hydrogen bonding strength varies between molecules and some molecules won't undergo hydrogen bonding causing different bond lengths and stretch frequencies.

  • $\begingroup$ Or that the intermolecular distances vary, unlike in a molecular bond where they're relatively stable (although, consider molecules like ammonia, which flips back and forth, as in a MASER). $\endgroup$ Feb 27 at 1:34


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