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Hydrogen Bond. |
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Answer» Whenever a substance contains a hydrogen atom linked to a highly electronegative atom N, O or F, the latter attracts the pair of electrons more and becomes slightly negative whereas the hydrogen atom becomes a slightly positive end. The negative end of the molecule is attracted by the positive end (i.e., Hydrogen atom) of the other molecule and in this way a bond is formed. Such a bond is called a hydrogen bond and is represented by a dotted line. Thus the hydrogen bond between the hydrogen atom bonded to the electronegative atom X may be represented as follows: – – – X – H – – – X – H – – – X – H – – – In this situation the hydrogen atom is attached simultaneously to two electronegative atoms. Hence it acts as a bridge between the two and is, therefore, called the hydrogen bridge. |
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