dipole-dipole means? and diff between non polar and polar? is it really part of organic chem?
bond of two polar molecules
one side +, the other side -
Try water for example
http://www.google.com/search?q=dipole+dipole+bond+examples&ie=utf-8&oe=utf-8
It's a part of chemistry, not necessarily organic chemistry. Organic molecules are both polar ans non-polar as are inorganic molecules.
Examples for organic molecules:
C2H6 is ethane which is non-polar
C2H5OH is ethyl alcohol which is polar.
Examples for inorganic molecules:
H2, Cl2, Br2, I2 all are examples of non-polar.
H2O is polar. NaCl is polar.
Dipole-dipole is a type of bonding in which one dipole is attached to another dipole. Water is an example with the negative end of one H2O molecules attaching itself to the positive end of a second water molecule to form (H2O)2. For water the normal structure depends upon the temperature with the molecular formula of (H2O)n where n is 4 for water at room temperature to n = 1 for water in the vapor state at 100 C.
The term "dipole-dipole" refers to a type of intermolecular force that occurs between two polar molecules. In a polar molecule, there is an uneven distribution of electron density, leading to a partially positive end and a partially negative end. This separation of charge creates a dipole, or a polar moment, within the molecule.
Dipole-dipole forces occur when the positive end of one polar molecule is attracted to the negative end of another polar molecule. These forces are relatively strong compared to other intermolecular forces. They contribute to both the physical properties and the behavior of polar substances, such as their higher boiling points and increased solubility in polar solvents.
On the other hand, the difference between nonpolar and polar molecules lies in the equal or unequal sharing of electrons within a covalent bond. In a nonpolar molecule, electrons are shared equally between atoms, resulting in a symmetrical distribution of charge. As a result, nonpolar molecules do not possess a dipole moment.
In contrast, polar molecules have an uneven sharing of electrons due to differences in electronegativity between bonded atoms. This results in an asymmetrical distribution of charge, leading to the presence of a dipole moment. Polar molecules exhibit dipole-dipole interactions, while nonpolar molecules do not.
Regarding your last question, dipole-dipole interactions and the concepts of polar and nonpolar molecules are indeed relevant in organic chemistry. Understanding these concepts is crucial for predicting the physical properties, reactivity, and behavior of organic compounds. For example, the solubility of organic molecules in polar or nonpolar solvents can be attributed to the presence or absence of dipole-dipole interactions. Furthermore, the polarity of functional groups within organic molecules affects their intermolecular interactions and can influence reaction rates and selectivity.