Question

Every SN1 reaction does not always have a competing E1 reaction. Explain why that is and show examples

Answer 1

Sol:

Among the reactions which does not always have a competing E1 reaction, the best reaction is that in which a substrate have a leaving group attach to the primary carbon. Rest possible cases and conditions are explained below.
Sol: Answer to the given question is as follows: 7 monder anwer it finst we nowe to compare Eliminatim versus substitution reaction Elicination versus substitution: @ nucleophile that are strong bouse favour elimination over Substitution O. High temperature favowy elimination over substitution © Bulky Nucleophile fovour elimination over substitution → Following voore the examples of various kind of substrate that favour El elimination over Sw' substitution. . Tertiary ** NE → Stabilised can bocation Nu in ' maction. Nu & this kind of substrate eelso go very well

6. Secondary fx e less stable cambocation Y Nu o . & El (slow) & Sn' (More favourable) Xx N [ 9 the nucliophile es where was it a weakly basic neucleophile like &-, R5 is por eg. tho, RoH] used then Ą will be more preferred one. → 96 strongly basic unhindered nucleophile like Room Strongly basic hindered nucleophile like OBU is used then E₂ will be more preferred one. . Primary Ex [ ] unstable carbocation here, only possibility of Snl reaction. El won't be able to compete here, as it would lead to a very unstable carboccasion.

Examples - leaving group] este ano naEr L let - OTS In Route -1, the positive charge is delocalised around the benzene ring and it will lead to nothing. an Route - 2. to preserwe the varomaticity of the benzina ring, benzyl cation valway react on side chain. Thus, the Nucleophile waittack on the benrylic cation. Here, in this kind of cases no more competition with E, reaction, only possibility it Sn' reaction.

Some more is the best vas follows: examples where Spl reaction option over E - reaction are ACOM with E, recichon, here. → No pone competitim