CBSE class 12 Chemistry Online Notes & Solutions Hydrogen Bonding
CBSE class 12 Chemistry : Takshila Learning regularly offers different blogs and articles on important topics, news, and information related to school courses, professional courses, and skill development courses. In this article, the following topic “Hydrogen Bonding” from the unit Bio molecules of Class 12 Chemistry syllabus is discussed.
A bond is Associate in Nursing magnetism attraction between polar molecules during which atom (H) is absolute to a bigger atom, like gas (O), atomic number 7 (N) or element (F). this can be Associate in Nursing attraction between positive and negative poles of the charged atoms
Properties of Hydrogen Bonds
- Hydrogen bonding affects the boiling point of the molecules. The boiling point usually increases with the increase of the molecular mass. However, molecules that are involved in intermolecular H-bonding have much higher boiling points in comparison with the molecules of the same molecular mass that are not involved in H-bonding. This is because the unusually strong H-bonding forces allow for stronger interaction. For example in water molecules the strong hydrogen bond results in a higher boiling point of water. In addition, H-bonding is also responsible for many unusual proprieties of water, such as its high melting point, the heat of vaporization, high dielectric constant, surface tension, capillary action etc.
- As we have discussed hydrogen bonding can occur between hydrogen and four other elements. Oxygen (the most common), Fluorine, Nitrogen, and Carbon. Carbon is the special case in that it only really interacts in hydrogen bonding when it is bound to very electronegative elements.
- Hydrogen bonding is an important component of the three major macromolecules/bio molecules in biochemistry such as proteins, nucleic acids, and carbohydrates. These are all hydrocarbons containing carbon as an important constituent. The H-bonding is responsible for the structure and properties of all the macromolecules. Hydrogen bonding is applicable in these bio molecules because of the presence of functional groups present, like carboxylic acid (-COOH), alcohol (-OH) or even amine groups (NH2).
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