Organic chemistry, viscous fundamentals, fundamentals of reaction mechanism, mechanism in organic compounds. So, basic principle, environment reaction mechanism in organic compounds. So, generally the organic compounds, so means reactant, so generally nothing but that is called as reactant, r-substrated or reactant. That is first, initially that is converted to intermediate, intermediate, finally the use product, because that is your final product. So, this is the reaction mechanism, means in organic compounds the reactant is not directly converted to product, it is initially converted to intermediate, then finally use product. So, these are the steps involved in reaction mechanism of organic compounds. Now, in this, in reaction mechanism the reactant is converted to product, the reactant is undergoes bond breakage or bond formation or homolytic cleavage or etrolytic cleavage, means based on fusion, based on fusion, these are classified to two types. One is homolytic cleavage and next one is heterolytic cleavage. Homolytic cleavage and next one is heterolytic cleavage. In that first one, ye, homolytic cleavage, homolytic cleavage. For example, I am considering one a, simple example, that is a, b, a bond b, this is undergoes homolytic cleavage, this homolytic cleavage we can represent is afukaru, this sigma bond is undergoes cleavage through afukaru or it gives two types of products, one is a radical, it produce in radicals, two radicals are formed. Means in homolytic cleavage, generally produce a free radical, means one electron, one pair of electron is distributed through two atoms. So, the unshaired pair of electron is called as free radical, means in homolytic cleavages, the free radicals are formed. So, this is represent as afukaru, generally homolytic cleavages are occurring in presence of sunlight or photochemical conditions and next one b is heterolytic cleavages. heterolytic cleavage means for example, same example, this sigma bond is undergoes full afukaru, that means that cleavage is full with representation, means heterolytic cleavages, it produce cation, another one is anion. So, two types of charged particles, one is cation, particle another is anion, particle, the cation containing its valence is 6th, the anion containing its valence is octet. So, this is a retrolytic cleavages, means during the retrolytic cleavages, ions are formed in homolytic cleavages, two radicals, the unshaired pair of electron is formed. So, now we are concerned the organic example for homolytic cleavages, for example, ethane or if you consider a methane, the methane is reactive with halogen, that is chlorination process. During the chlorination process in presence of photochemical condition, it produce CH3Cl and again chlorination process it gives CH2Cl2. So, and again CHCl3 and finally produce CH4, carbon tetra chloride, in each step it eliminated HCl, hydrogen chloride. So, means the methane undergoes chlorination in presence of photochemical condition, it produce methyl chloride, methylene chloride, annextron is chloroform and final product is carbon tetra chloride. For this is your general reaction, so reactant is converted to product, but it represent as a intermediate through a mechanism. So, its mechanism is so CH4, so the CH4 and now I am represented like this, CH3 bond CH. So, nothing but CH4, this is undergoes homolytic cleavage. In homolytic cleavages it produces two radicals, methyl radical, next one is hydrogen radical. Similarly, CL2, so chlorine, this chlorine also again undergoes homolytic cleavages in presence of photochemical condition, it produce again two radicals, two types of chlorine radicals, here CH3 radical is interact with chlorine radical, it gives methyl chloride, these are first product and hydrogen radical with chlorine, it gives hydrogen as CN. So, this is your homolytic cleavages, so means in homolytic cleavages only free radicals are formed. The best example is methane undergoes chlorination process in primes of photochemical condition, gives various products.