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No carbonation are formed instead transition state appears in SN2 reaction . Why? Give reason.
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Answers
Explanation:
Heyya!!✨ Carbocation is not formed in SN2 reaction. In SN2 reaction, there are mostly primary nucleophiles which have less hindrance for an electrophile to let it attack on it from both sides as the halogen leaves. When both halogen and electrophile attaches to the nucleophile, an transition state is formed (complex). therefore, as both of the steps are occuring simultaneously, no carbocation is formed!
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Answer:
In SN2, first thing to be noticed is that here we use polar aprotic solvent(Acetone) that means we mix chiral compound in this solvent but as the solvent is aprotic that means it does not have protons to give. Hence chiral compound doesn't get break and then we use nucleophile which is strong enough as the first step is carried out by nucleophile.Hence there is repulsion and back bonding.But in case of SN1,the solvent used is polar protic solvent (example H2O) hence the chiral compound gets broken and hence there formation of carbonation and hence the nucleophile is not strong enough