Notices
Results 1 to 3 of 3

Thread: functional groups

  1. #1 functional groups 
    Forum Freshman
    Join Date
    Aug 2014
    Posts
    8
    hi could someone please explain or send a link for how different functional groups alter boiling points

    thank you


    Reply With Quote  
     

  2.  
     

  3. #2  
    exchemist
    Join Date
    May 2013
    Location
    London
    Posts
    2,522
    Quote Originally Posted by tecnica View Post
    hi could someone please explain or send a link for how different functional groups alter boiling points

    thank you
    This is an organic chemistry question, I take it. Functional groups alter molecular weight, molecular shape and intermolecular attraction. Higher MW tends to increase boiling point, a more sinuous shape also increases boiling point due to "tangling" of chains and stronger intermolecular attraction will also do so. Functional groups containing hetero atoms will introduce polarity into the molecule and these dipoles can be a powerful source of intermolecular attraction. Where a dipole-inducing hetero atom with" lone pairs" of non-bonding electrons is joined to hydrogen, one can also get hydrogen bonding, e.g. in alcohols and amines. All these things increase boiling point.

    Here is one link that I found very quickly - there may be other, better one if you look harder": 3 Trends That Affect Boiling Points


    Reply With Quote  
     

  4. #3  
    KJW
    KJW is offline
    Forum Professor
    Join Date
    Jun 2013
    Posts
    1,134
    Quote Originally Posted by tecnica View Post
    hi could someone please explain or send a link for how different functional groups alter boiling points

    thank you
    You could explore this yourself by examining the boiling points of relevant compounds, perhaps plotting series of boiling points on a chart. Organic chemistry textbooks usually do such comparisons as well for various functional groups.

    It's worth noting that sometimes, there can be anomalies for particular reasons. For example, o-nitrophenol has a much lower boiling point than m- or p-nitrophenols because intramolecular hydrogen-bonding between the adjacent hydroxyl and nitro groups supplants the intermolecular hydrogen-bonding that would otherwise increase the boiling point.
    There are no paradoxes in relativity, just people's misunderstandings of it.
    Reply With Quote  
     

Similar Threads

  1. Replies: 102
    Last Post: April 19th, 2013, 03:17 PM
  2. Functional Analysis
    By Guitarist in forum Mathematics
    Replies: 23
    Last Post: May 10th, 2011, 08:05 PM
  3. RNA and proteins functional groups
    By Deividas in forum Chemistry
    Replies: 3
    Last Post: August 1st, 2009, 09:49 PM
  4. RNA and proteins functional groups
    By Deividas in forum Biology
    Replies: 4
    Last Post: July 28th, 2009, 07:46 AM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •