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Where should SN1 & SN2 reaction take place? How can be it determined? Explain with examples.

Where should SN1 & SN2 reaction take place? How can be it determined? Explain with examples.

Grade:10

2 Answers

Vishal S K
11 Points
6 years ago
Reactions which takes place involving tertiary alkanes can be differentiated as SN1 and reactions involving primary alkanes as SN2
Shramana Kar
112 Points
6 years ago
There are mainly 2 determinants of SN1 & SN2 reaction:1)the structure of substrate:if there are so many alkyl groups with alpha carbon the steric hindrance increases & nu^- can`t attack alpha carbon.hence sn2 can`t take place sn1 occurs.As carbocation is produced in sn1 reaction.so it depends on the stability of carbocation.for this reason methyl halides are more reactive in sn2 but tertiary halides are in sn1.2)nature of solvent: if the solvent is polar protic e.g. h2o, methyl alcohol , ethyl alcohol etc. then it will go for sn1.as solvent stabilize both carbocation & halide.but if solvent is polar aprotic e.g. DMSO,DMF then sn2 takes place.as solvent stabilize only cation.Allyl & benzyl cations gain stability by resonance.so they are more stable in sn1 than primary halides.it depends on solvent & nu^- if they go for sn1 or sn2.

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