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Pre-Requisite Reading: Nucleophiles, Electrophiles
A chemical bond strength is a force holding the atoms in a bond, and separating such atoms requires energy input. The bonds are of two types- Intermolecular and Intramolecular bonds.
Intramolecular bonds join the atoms in a molecule, whereas Intermolecular bonds are only responsible for closely associating the molecules. Therefore, Intramolecular bonds require higher energy to break than intermolecular bonds.
Carbon's nondiscriminatory nature to form bonds with itself and other elements has led to a wide variety of small and large organic compounds. Carbon-hydrogen compounds called hydrocarbons are mostly inert; however, carbon with other elements (N, O, S, halogen) form functional groups, the reactive part of the molecule. The functional group part of the molecule is where chemical transformations occur. Some organic compounds can have more than one functional group.
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.
There are three types of Van der Waal’s force- Keesom Forces, Debye forces, and London Dispersion forces. Amongst the three types, the London Dispersion forces are the weakest interactions.
1) The first step is find out the Degree of Unsaturation (the number of double bonds or the presence of a ring) in the compound.
The formula is,
The bond angle is the angle at which two adjacent bonds converge and meet at the central atom in molecules.

Around the early 1800s, scientists began to notice the presence of isomerism in all types of compounds; however, at the time, it was referred to using different names.
The term allotrope was used to describe different varieties of an element that existed in different physical forms, such as diamond or graphite for carbon or monoclinic or rhombic for sulfur. Polymorphism was used to explain compounds that occurred in more than one crystalline form, like aragonite and calcite, both crystalline forms of calcium carbonate.