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Question:

The correct order of increasing basicity of the given conjugate bases (R=CH3) is:

RCOO⁻<HC=C⁻<R⁻<NH₂

R⁻<HC≡C⁻<RCOO⁻<NH₂

RCOO⁻<NH₂<HC≡C⁻<R⁻

RCOO⁻<HC≡C⁻<NH₂<R⁻

Solution:

In basicity, more available the electrons, the more readily they can be donated to form a new bond to the proton and, and therefore the stronger base. If bronsted acid is a strong acid then its conjugate base is a weak base and vice versa. So, correct order of increasing basic strength is RCOO⁻<HC≡C⁻<NH₂<R⁻