The pair in which former is stronger nucleophile than later in polar aprotic solvent is CH₃NH₂ and (CH₃)₂NH. The correct option is A.
Nucleophiles are molecules that have a pair of electrons that can be shared. They are also called electron rich species.
Polar aprotic solvents are incapable of forming hydrogen bonds with the substrate. They don't have any hydrogen atoms directly connected to an electronegative atom, so they can't form a hydrogen bond.
Acetone, chloroform, dichloromethane, and other aprotic solvents are examples.
Thus, the correct option is A. CH₃NH₂ and (CH₃)₂NH.
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