Which is the best method of preparing `2^(@)` amine ?

Which is the best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain ? Give mechanism.

Which of the following is the best method for preparing aspirin?

Which of the following methods of preparing of amines will give some number of carbon atoms in the chain of amines as in the reactant?

Which of the following methods of preparing of amines will give some number of carbon atoms in the chain of amines as in the reactant?

Which of the following methods of preparing of amines will give same number of carbon atoms in the chain of amines as in the reactant?

Methods of preparation of Amines

Which of the following methods of preparation of amines will give same number of carbon atoms in the chain of amines as in the reactant?