Explain sn1 and sn2 of haloalkanes with examples
Answers
Answer:
SN2 reactions are highly favoured by strong nucleophiles or high concentration of nucleophiles.
Nucleophilicity is a kinetic controlled parameter, ie, a nucleophile which reacts faster is considered to be a better nucleophile.
higher the charge density on the nucleophile greater is its nucleophilicity.
SN2 reactions are bimolecular elementary and single step. They don't have intermediates. They result in inverted configuration. They are favoured in polar protic solvent. Better the leaving group, better the chances for SN2 pathway.
order-
CH4 > Primary hydrocarbon> Secondary hydrocarbon> Tertiary hydrocarbon
SN1 It is unimolecular nucleophile substitution reaction. it is complex reaction and takes place in more than one step. It is favoured in polar protic solvent. They also form intermediates and undergo rearrangement. Better the leaving group better chances for SN1.
order-
tertiary hydrocarbon> secondary hydrocarbon> primary hydrocarbon> methane.