Posts

Showing posts from March, 2021

Isomerism in Organic Compounds- I

Image
Isomers are sets of molecules which possess the same molecular formula but have a different  arrangement of the atoms in space. This is the definition you might have read. Let us take an example.  Think about the formula of C₆H₁₂. What would its structure be?  Since it follows the CₙH₂ₙ, we know that it probably is an alkene.  An alkene is a hydrocarbon that possesses a double bond. But the location of the double bond can be identified only based on its IUPAC name. It can have the following possible structures.    Or it can even be a cyclic compound.      As you can see, each and every compound above has the same molecular formula but the arrangement of atoms in each case is different. Each of these compounds have a different IUPAC name. So, they are all isomers. C₆H₁₂. can have up to 25 isomers. There exist different types of isomers which I will write about in the next post. 

Qualitative analysis of Organic compounds (Part 2)

Image
As mentioned in the previous post, preliminary tests act as a base of qualitative analysis. In this step, the physical characteristics of the organic compounds are observed.The various tests are, Colour  Small organic compounds are usually colourless. The colour in organic compound is due to the presence of a group called a chromophore.This group plays an essential part when we study the Ultra- violet spectra of organic compounds. Odour Certain functional groups show a characteristic odour. This can help us gauge the type of functional group present in the organic compound. For example, esters give off a fruity odour.  State Compounds can be either solid or liquid.  When the compound looks like talcum powder, it is an amorphous solid. Whereas, when the crystals are defined, it is considered crystalline.   Crystalline   Amorphous The basic difference between the two is the molecular arrangement. When the molecules are arranged in a proper order it is a cryst...