One of the most interesting and useful aspects of stereochemistry is the study of what happens to optically acitive molecules when they react. The product isolated from the reaction of the chiral material can tell us a great deal about the reaction mechanism. We observe
S N 2 ⎯→ Inversion of configuration
S N 1 ⎯→ Racemisation
S N i ⎯→ Retention of configuration
(i) In the given reactions, the reaction mechanism respectively is :
( Ι ) 
( ΙΙ ) 
+ 
( ΙΙΙ ) 
( Ι V) 
Text Solution
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(i) I 
Inversion of configuration 
S N 2
II 
Racemisation takes place 
S N 1
III 
Retention of configuration 
S N i
IV 
Inversion of configuration 
S N 2
(ii) In this reaction retention of configuration takes place so it is S N i mechanism.
(iii) 
Retention in configuration.
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