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Which of the following is not a common hydrogen bond acceptor?a)Tertiary amine...

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catbyshe | Student, College Freshman | eNoter

Posted July 18, 2011 at 6:27 PM via web

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Which of the following is not a common hydrogen bond acceptor?

a)Tertiary amine

b)Primary amine

c)Hydroxyl

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ndnordic | High School Teacher | (Level 2) Associate Educator

Posted July 19, 2011 at 4:46 AM (Answer #1)

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Hydrogen bonding takes place between the hydrogen atom of one molecule and an electron pair on a different atom of that same molecule.  Hydrogen bonding will occur where partial positive and negative charges can form within a neutral molecule because of differences in electronegativity between the atoms within the molecule.

The most common example is in water where the hydrogen atom of one water molecule can form a hydrogen bond with the oxygen of another water molecule.  This can happen because the strongly electronegative oxygen atom draws the bonding electrons toward itself and away from the hydrogen atoms.

A primary amine is neutral overall but can form hydrogen bonds between its own molecules in a fashion similar to water.  The nitrogen is partially negative and the hydrogens are partially positive.

A tertiary amine can be a hydrogen bond acceptor with another type of molecule but not with itself since it has no hydrogen atoms around the nitrogen.

Since hydroxyl is a hydrogen bond donor it is not considered a hydrogen bond acceptor.

 

 

 

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