C-H bonds. Polar or non-polar?

In summary, the bonds between Carbon and Hydrogen tend to be non-polar, with some exceptions depending on the nature of the carbon atom. The pKa of acetylene is around 25, making its proton slightly acidic. The sp3 carbon-hydrogen bond is not polar, while the sp carbon-hydrogen bond is more polar but still not considered a strong example. In the case of CH4, the individual C-H bonds are also non-polar. There is no strict distinction between polar and non-polar bonds, but any bond between different elements will have some degree of polarization.
  • #1
blazinknight
2
0
Are bonds between Carbon and Hydrogen polar?
 
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  • #2
They tend not to be but it depends on the nature of the carbon atom. If the carbon is acetylene, the proton is considered to be somewhat acidic. sp3 carbon-hydrogen bond isn't really polar. sp carbon-hydrogen bond is much more polar but not really what I would use as an example of polar. pKa of acetylene is around 25.
 
  • #3
in the case of ch4. would the individual c-h bonds be counted as polar bonding?
 
  • #4
There's no strict distinction between 'polar' and 'non-polar' bonds (or ionic and covalent, either). Any bond between two different elements will invariably have some degree of polarization.

But a C-H bond is fairly non-polar in any circumstance, and yes, it's quite non-polar in CH4.
 
  • #5
No..!

As the difference in electro negativities of Carbon and hydrogen comes out to be less than 7(I guess) its sufficiently non-polar.
 

1. What is the difference between polar and nonpolar C-H bonds?

The polarity of a C-H bond depends on the electronegativity difference between the carbon and hydrogen atoms. If the electronegativity difference is less than 0.4, the bond is considered nonpolar. If the difference is greater than 0.4, the bond is polar.

2. How does the polarity of a C-H bond affect its reactivity?

Polar C-H bonds are more reactive than nonpolar C-H bonds. This is because the polarity of the bond allows for easier breaking and formation of new bonds during chemical reactions.

3. Are all C-H bonds in a molecule polar or nonpolar?

No, a molecule can have both polar and nonpolar C-H bonds depending on the electronegativity differences between the carbon and hydrogen atoms in each bond.

4. Are C-H bonds always considered nonpolar in organic compounds?

No, there are exceptions where C-H bonds in organic compounds can be polar. For example, in compounds with highly electronegative atoms, like oxygen or nitrogen, attached to the carbon atom, the C-H bonds may become polar due to the electronegativity difference.

5. How does the polarity of a C-H bond affect the physical properties of a molecule?

The polarity of C-H bonds can have a significant impact on the physical properties of a molecule. Polar molecules have higher boiling points and are more soluble in polar solvents, while nonpolar molecules have lower boiling points and are more soluble in nonpolar solvents. This is because polar molecules can form stronger intermolecular attractions compared to nonpolar molecules.

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