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Topic: Hydrogen Bond Questions  (Read 9002 times)

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Offline Winga

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Hydrogen Bond Questions
« on: July 16, 2005, 08:46:55 AM »
Q.1
The attraction between the partial +ve H of chloroform and the lone pair of carbonyl oxygen of ester is a hydrogen bond or not?

Q.2
Hydrogen fluoride, HF forms H-bond by the attraction between H of one HF molecule and F of another HF molecule.
Then, what kinds of bond between H and F of same molecule?
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Offline Donaldson Tan

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Re:Hydrogen Bond Questions
« Reply #1 on: July 17, 2005, 05:40:37 PM »
Q1. no, because the H from chloroform is not bonded to F, O or N.

Q2. covalent bond
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Offline Mitch

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Re:Hydrogen Bond Questions
« Reply #2 on: July 17, 2005, 06:39:03 PM »
Quote from: Winga on July 16, 2005, 08:46:55 AM
Q.1
The attraction between the partial +ve H of chloroform and the lone pair of carbonyl oxygen of ester is a hydrogen bond or not?


Yes, but the correct answer is no.
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Offline Winga

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Re:Hydrogen Bond Questions
« Reply #3 on: July 17, 2005, 11:31:53 PM »
For Q.1,
From one of the AL reference books, it mentions that this bonding is H-bond, so I just want to make sure it.


For Q.2,
Obviously, it is a covalent bond theoretically, but how can we distinguish which one is covalent bond or hydrogen bond in pure HF liquid?

Are they all the bonds between all H and F atoms are identical (thereoretically)?
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Offline Winga

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Re:Hydrogen Bond Questions
« Reply #4 on: July 18, 2005, 01:14:31 AM »
For Q.2

I mean to which F- ion does H+ belong to?
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arnyk

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Re:Hydrogen Bond Questions
« Reply #5 on: July 18, 2005, 09:59:02 PM »
Between H+ and F- in a molecule it is covalent (polarish).  Between HF molecules I would say partial electrostatic differences like in water.
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Offline Winga

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Re:Hydrogen Bond Questions
« Reply #6 on: July 19, 2005, 03:07:04 AM »
For Q.1, if the strength of dipole-dipole interaction is as strong as H-bond, is it still called Van der Waal's force?
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