Question

5) For an Sn1 reaction what is the reaction rate order? How many steps are in the reaction? Which step is the slow step and why is it the slow step? What happens if you form a chiral center when performing an Sn1 reaction?

Answer 1

slow - C + Ga leaving 1 group stepe ecte ne Nuo fast step 30.- stepona Sala este in c+ +ZqⓇ et - carbocation intermediate The first step is the neamoval of leaving group 'CG from the molecule to form calbocation intermediate . . step@. nuk Tattack of nucklophile on the electrophilic carbocation to form a new o band. . . Reaction Rate order: Rate of the reaction r= k[R-LG] order of the reaction n=1 ist order reaction. How many steps are muebied:- It is a multi-step reaction ... Non concerted real tim. In this reaction mechanism, multi-step reactions have intermediates & multiple transition states. (Ts). In Srimple SN reaction, we have two steps (two tromsition states) & one intermediate (calbocation) ar Which Step in slow steps - The first step, where the removal of leaving group from the molecule in the slow step.

s+ S- R-X L St S- R-Na why it is slow stepen This step (forst) is slow because the reaction requires bond breaking (endothermic, & heat is required) to remove the leaving group ... This is a slow step on rate determining step. . for the bond breaking II process NuotrtLG in 1st step, requires high energy of I nuotR-X Rana activation, which leads - to the callocation intermediate, which is in higher energy state than the starting material. Due to this high energy of activation, this step is slow step. → reaction coordmate

of chiral centre is presenti in SNIE- - R -ċ x + nuo - R _ Nu + Nu- CR Ril R! inversion Retension top face attack NUOR STy R – co RI slow step "P - → da und -C*x R é R! meeb. Recomic mature. R!. • R _ 1* _Nu + nu-dk-R C . Th. fast Neue R step bottom face 3° callocation Retension inversim stable, spr trigenal planar Recamic mixture If the chiral centre is present, then the products we get is Recemic mintale ( Retensiam & inversion products) Ngo attacks carbocation from both top face & bottom face to farm Reciemiemmtuna (Enantiomers)
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