For alkanoic acid and alkanol of similar mass, alkanoic acid has a higher b.p. since alkanoic acid forms stronger and more hydrogen bond than alkanol ?
Why alkanoic acid forms stronger and more hydrogen bond than alkanol?
Isn't it both form same no. of hydrogen bond per molecule as both have one hydrogen only.
hydrogen bond
2008-07-19 6:29 am
回答 (3)
2008-07-19 11:24 pm
✔ 最佳答案
http://hk.myblog.yahoo.com/wilson_007_35/article?new=1&mid=810請上呢個網址, 它有解答
放心冇毒, 因為呢個係yahoo blog
2008-07-26 12:42:29 補充：
哈哈哈......先多謝知識友A student..有批判思考
維基百科講既野一定最準確最岩??
維基講既定義係一小部份情況的H-bonds
真正最General的定義,suit所有的情況就是我所講的
你都識講係special type啦..
事實上..你所指的special type其實係好commom架喎...
因為預科常見的organic compounds都有amide, hydroxyl, halide groups啦..
仲點叫special type??
唷唷....知識就咁局限左係維基入面...
參考: Myself
2008-07-24 7:19 am
As we known that,H-bond is a electrostatic attraction between the lone pair electrons of electronegative atom and a H atom bonded with a electronegative atom
alkanol can only form 1H-bond while alkanoic acid can form 2 (and appear as a form of dimer)
Therefore,alkanoic acid has a higher m.p. than alkanol as it has more H-bond which require more energy to break it.
I hope i can help u a bit~~
alkanol can only form 1H-bond while alkanoic acid can form 2 (and appear as a form of dimer)
Therefore,alkanoic acid has a higher m.p. than alkanol as it has more H-bond which require more energy to break it.
I hope i can help u a bit~~
參考: me
2008-07-23 6:25 pm
Note that the definition of a hydrogen bond isn't as said by 冷風. It is, according to wikipedia,a special type of dipole-dipole force that exists between an electronegative atom and a hydrogen atom bonded to Nitrogen, Oxygen or Fluorine.
2008-07-23 10:25:53 補充：
Which is, a weak non-bond attraction between an electron-attractive atom and a NH, OH, FH group.
2008-07-23 10:25:53 補充：
Which is, a weak non-bond attraction between an electron-attractive atom and a NH, OH, FH group.
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