SN1 SN2 NUCLEOPHILLIC SUBSTITUTION REACTION STEREO SELECTIVE REACTIONS

SN1 SN2 NUCLEOPHILLIC SUBSTITUTION REACTION STEREO SELECTIVE REACTIONS

1. STEREO SELECTIVE SN1 SN2
REACTIONS

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4. Different Types of SN Reactions
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9. Waldens Inversion
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18. Waldens Inversion
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23. Some Important points for SN-2 Reaction:
(i) Reactivitiesof alkyl halides in SN2substitution is governed
by stericfactors.
The bulkierthe group, that less reactive it will be.
(ii) Reactivity order of alkyl halide varies as follows :
CH
3X > 1°halide > 2°halide > 3°halide
(iii) The order of reactivity among 1°alkyl halides is :
CH
3X > C2H
5X > C
3H
7X ….etc.
Remember that in case alkyl halide is optically active,
SN2reactions lead to Walden inversion.
(iv) Thus in short 3°alkyl halides reactby SN1,1°by SN-2 and
2°by either or both of them SN1 and SN2 depend on the
nature of theR-X and thereagents, Solvents.YOGI SIR CHEMISTRY

24. (v) For a given alkyl group the order of reactivity is –
(for SN1 and SN2 both) : RI > RBr> RCl> RF
(vi) In addition to substitution reaction alkyl halide also
undergo elimination reactions to form alkene with the
removal of molecule of hydrogen halide that is
(dehydrohalogenation).
In dehydrohalogenation, hydrogen and halogen atoms are
eliminated from two adjacent carbon atoms, the reaction
also known as elimination may proceed by E1 & E2 mechanism
(analogous to SN1 and SN2 mechanism).
The order of eliminationreaction is :
3°halides > 2°halides > 1°halides
(vii) In general 3°halides tend to react by elimination;
1°halides by substitution and 2°halides by either or
both of the reactions. YOGI SIR CHEMISTRY

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26. Nucleophillic Substitution
Reaction
SN-1 Unimolecular Reaction
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