How does a covalent bond break?
Did you know that, back in the 1900s, it was believed that a hook and a loop type of closure was the covalent bond responsible for holding atoms in a molecule? Interesting, right?
Organic Chemistry
Heteroatomic molecules
When atoms of different types combine to form molecules, it is a heteroatomic molecule. For example, when Carbon (C) and Oxygen (O) atoms combine under an appropriate reaction condition, it can lead to the formation of two types of products (carbon monoxide, CO, and carbon dioxide, CO2) containing two types of atoms.
A heteroatomic molecule can be diatomic (like hydrogen chloride, HCl), triatomic (like water, H2O), or polyatomic (like methane, CH4).
Meta Directors
The meta directors are a class of atoms or a group of atoms that, when attached to an aromatic ring, render it with the ability to direct an incoming electrophile to its meta (third or fifth) position in an electrophile aromatic substitution reaction.
Difference between Free radicals and Carbocations
Free Radicals | Carbocations |
|---|---|
Free radicals are electron-deficient atoms or groups of atoms. It can include carbon-centered free radicals (for example, H3C.) and non-carbon-centered free radicals (for example, HO., Cl., etc.). | Carbocations are electron-deficient carbon atoms. |
Free radicals do not carry any charge and are neutral species. |
sp3 hybridization of Carbon
The three common hybridization states are - sp3, sp2, and sp. The sp3 (pronunciation: ess-pee-three) hybridization of Carbon explains its four bonds’ tetravalency, shape, and equivalency.
How will you convert ethanal to propanone?
Ethanal is a two-carbon aldehyde, and propanone is a three-carbon ketone. The increase in one Carbon number is possible using a Grignard reagent (Methyl Magnesium Bromide, CH3MgBr) to form a new Carbon-Carbon bond.
Preliminary Qualitative Analysis of some Organic Compounds
Learning Objective: To study how to determine by qualitative analysis the physical properties of the state, nature, odor, color, solubility, and physical constants of an unknown organic compound.
Skill Level - Intermediate
Prerequisites:
Differences between Valence Bond Theory (VBT) and Molecular Orbital Theory (MOT)
Aspect | Valence Bond Theory (VBT) | Molecular Orbital Theory (MOT) |
|---|---|---|
Basic Concept | Describes chemical bonding as the overlap of atomic orbitals, forming localized bonds. | Describes bonding by combining atomic orbitals into molecular orbitals that are delocalized over the molecule. |
Bonding Explanation | Focuses on bonds as being localized between two specific atoms. |
Why the dipole moment of NF3 is less than that of NH3?
The dipole moment, a product of charge difference (q) and the distance (d) between the centres of positive and negative charges (µ = q x d), is also directional. The direction is indicated by an arrowhead, which points towards the most electronegative atom, representing the direction of the dipole moment.