Unimalecular peucleophilic substitution (SN' Reaction) These are the complex wactions which ane takes place in more step generally completed than one in tes steps. (see I general reaction mechanism) In these reactions the este of reaction become proportional (depend) only 4 independent of nucleophile as the reaction the the attackin In the first step start the rate of reaction become slow where group L first the leaving wiltrow the bendisigt withdraw electron from substrate carbon atom & become indyendent ass fully negatively charge anton At the s Shaving three covalent bonds in same. Plane at 120° and it is the carbocation the reaction intermediate of SN' reactions.. Now in second stip, the corking comhine with the carbocation final product (Here the graphe plotted) rapidly and I fom wwill be The existance of -trapped sesangene identityndir in suitable Geometriasey trivalent the hare studied. orange species is allt the toivalencles in single place at 120° which is different from and also the from product in exisk tetrahidral so, it which can substrate assunked that planar trigonal speeles of orange colour is carbocation, which is election defficient and having tendency to combine with species an kinolnict Thy hududlysis of tophenyl methyl bromide, int probened of of triphenge Bodidem Padide methyl Padide form nasture toi lodide Indicates that reac? takes plane through the intermediate as below: formation of ot the reas com. explaind Triphenyl methyl alcohal is usual feinduct but formations of buiphenyl methyl lodide prove that some cationic cationic c ect) spleies form Hwing mediam the reach which combine peresent at the the time with the In reach single product alcohol should be the only product. So, the formation of mixture products prove d's reach Intermediate in that et form SNI Maction Stereochemistry of Su' reach SN reaction in optically active substrate tapes place with racemisstion. It can be explained that the intermediate et become planas and Marving empty pr-orbital perpendicular to theplane so the Encoming musclesfits cam attack equally It t both sides to ystem at the either lobe the planar system. 2. 12 orbital. When nuclioperibe attack Form the same side of leaving groups the product retain -ation and t product its original Configur that sentention If nucleophile attack to the opposite lose from the substrate, the product well have the opposite tonfiguration it is inverted product. The mixture of retention product & inverted product chiled recima meture recimisation and process is But, the perfect prastically depends racemisation is stability of others e the amount of inverted then the the in ASN' product become product and rentention porduct miattere have optical actively obborib to the substats. The proces of recimisation can be understand. by the following explanation. But, the perfect prastically depends racemisation is stability of others e the amount of inverted then the the in ASN' product become product and rentention porduct miattere have optical actively obborib to the substats. The proces of recimisation can be understand. by the following explanation. Therefore the extent of reumisation depends on stability of solvated ct. As the stability of Encrease the symmetrical solvation more exists and amount of rectomisation Increase with the cost of inversion decrease. But overall SN reactions are said to tabes