Nucleophilic aliphatic substitution reaction is given by those compounds which have electron rich groups as leaving groups. Less is the basicity of the leaving group, more is its leaving power. R – L + 
R – Nu + 
In the given reaction, L is the leaving group which leaves as nucleophile. 
is the incoming group which is always nucleophilic in character. The reaction is nucleophilic substitution reaction which can be unimolecular or bimolecular reaction.
(i) Leaving power of which group is maximum ?
Text Solution
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(i) Leaving group in which the negative charge or lone pair of electrons is stabilized, is a good leaving group.
(ii) (CH 3 ) 3 
is strong base due to +I effect of three –CH 3 group but poor 
due to steric hinderance.
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